Dome/Courtesy light won't light except for with one door. Door Jamb switches go in and out easily, but still only one of the 4 doors kept open light the dome light.

Check fuses under the hood on driver side

Inadvertent Power
At the body control module (SBM) connector C1 cavity D1, inadvertent power is both an output and an input. The inadvertent power is either an output or an input, but never both. When the inadvertent power output is inactive, activating any lamp switch grounds the inadvertent power input through the lamp. As a result of the input, the SBM will activate the inadvertent power output.
The inadvertent power output supplies battery positive voltage (B+) to the lamps on CKT 1732 (ORN). Any of these lamps may drain the battery if you leave the lamps on. The SBM has a battery protection feature in order to protect the electrical system from these unwanted loads. The following 4 conditions may activate the inadvertent power output:
The ignition switch is in RUN.
The inadvertent power output is inactive and the inadvertent power input receives an active lamp input.
Any door opens.
The SBM receives an input from the remote function actuator (RFA) module.
The SBM deactivates the inadvertent power output if any lamp is active for more than 10 minutes and the ignition switch is OFF during the entire period.
Interior Lamp Control
The body control module (SBM) controls the function of the courtesy lamps. The IP junction block SBM fuse supplies battery positive voltage (B+) at all times to the SBM inadvertent power output. Battery positive voltage (B+) is supplied to the courtesy lamps as described above. The SBM provides a ground path to the courtesy lamps from the theatre dim-1 and the theatre dim-2 outputs . The theatre dim-1 supplies ground to the lamps on CKT 156 (WHT). The theatre dim-2 supplies ground to the lamps on CKT 157 (GRY). The SBM activates the outputs when a door is opened or the courtesy lamp switch activates. The outputs are deactivated when the SBM detects that all of the doors are closed and the courtesy lamp switches are inactive. If the outputs are deactivated because of a door closing, the outputs are deactivated with the theatre dimming function. The theatre dimming function causes the lamps to fade out gradually over a period of 3 seconds. If the outputs are deactivated by a courtesy lamp switch, the outputs are deactivated immediately without the theatre dimming function.


Your best bet , take it to a qualified repair shop .

Incandescent Lamps
When the park lamps are on, battery positive voltage (B+) is applied to the park lamp input in the panel dimming module. The dimming switch on the headlamp switch varies in resistance as the dimming switch is operated. The panel dimming module receives a variable input voltage based on the resistance of the dimming control. The panel dimming module supplies a variable voltage through CKT 8 (GRY) to the incandescent lamps. The voltage is proportional to the voltage input from the dimming switch. The lamps become brighter as the voltage level increases. The lamps become dimmer as the voltage level decreases.
VF Displays
The following components have a VF display:
• The radio
• The heater and A/C programmer
• The instrument cluster
• The head-up display (HUD)
When a module receives an ignition in RUN input, the module activates the VF display at full intensity. When the park lamps are on and the vehicle senses nighttime conditions, the lamp control module (LCM) supplies a dim enable signal to the components. When the module receives the dim enable input, ther module dims the VF display to the current dimming level. The radio and instrument cluster receive the dimming level input via CKT 8 (GRY). The HUD has a separate dimming control on the HUD switch in the overhead console. The HUD receives the dimming level input through CKT 622 (BRN). The heater and A/C programmer receive the enable and dimming level inputs from the radio through CKT 724 (PPL/WHT).

Courtesy or Dome Lamps Always On
Step
Action
Value(s)
Yes
No
1
Did you perform the Interior Lights System Check?
--
Go to Step 2
Go to Interior Lamps System Check
2
Connect a scan tool to the data link connector (DLC).
Turn the ignition switch to the RUN position.
Place the courtesy lamp switch in the OFF position.
View the body control module (SBM) courtesy switch input.
Is the input OFF?
--
Go to Step 3
Go to Step 11
3
Inspect the SBM auxiliary lighting input.
Is the input OFF?
--
Go to Step 4
Go to Step 14
4
Close all of the doors.
Inspect the driver door module (DDM) dome/buzzer switch input.
Is the input OFF?
--
Go to Step 5
Go to Step 16
5
Inspect the DDM passenger dome/buzzer switch input.
Is the input OFF?
--
Go to Step 6
Go to Step 20
6
Inspect the DDM left rear dome/buzzer switch input.
Is the input OFF?
--
Go to Step 7
Go to Step 24
7
Inspect the DDM right rear dome/buzzer switch input.
Is the input OFF?
--
Go to Step 8
Go to Step 28
8
Test CKT 156 (WHT) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems.
Is there a short to ground in CKT 156?
--
Go to Step 9
Go to Step 32
9
Test CKT 157 (GRY) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems.
Is there a short to ground in CKT 157?
--
Go to Step 10
Go to Step 32
10
Replace the SBM. Refer to Body Control Module Replacement in Body Control Module.
Is the SBM module replacement complete?
--
Go to Interior Lamps System Check
--
11
Disconnect the headlamp switch connector.
Is the SBM courtesy switch input OFF?
--
Go to Step 12
Go to Step 13
12
Replace the headlamp switch.
Is the headlamp switch replacement complete?
--
Go to Interior Lamps System Check
--
13
Test CKT 1495 (DK BLU/WHT) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems.
Is there a short to ground in CKT 1495?
--
Go to Step 10
Go to Step 32
14
Test CKT 1393 (DK BLU) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems.
Is there a short to ground in CKT 1393?
--
Go to Step 15
Go to Step 32
15
Replace the remote function actuator (RFA) module. Refer to Remote Control Door Lock Receiver Replacement in Keyless Entry.
Is the RFA module replacement complete?
--
Go to Interior Lamps System Check
--
16
Disconnect the left front door jamb switch connector.
Is the DDM driver dome/buzzer switch input OFF?
--
Go to Step 17
Go to Step 18
17
Replace the left front door jamb switch. Refer to Door Lock Actuator Replacement in Doors.
Is the door jamb switch replacement complete?
--
Go to Interior Lamps System Check
--
18
Test CKT 126 (TAN) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems.
Is there a short to ground in CKT 126?
--
Go to Step 19
Go to Step 32
19
Replace the DDM. Refer to Front Side Door Window Module Replacement in Doors.
Is the DDM replacement complete?
--
Go to Interior Lamps System Check
--
20
Disconnect the right front door jamb switch connector.
Is the DDM passenger dome/buzzer switch input OFF?
--
Go to Step 21
Go to Step 22
21
Replace the right front door jamb switch. Refer to Door Lock Actuator Replacement in Doors.
Is the door jamb switch replacement complete?
--
Go to Interior Lamps System Check
--
22
Test CKT 1177 (LT GRN) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems.
Is there a short to ground in CKT 1177?
--
Go to Step 23
Go to Step 32
23
Replace the passenger door module (PDM). Refer to Rear Side Door Window Module Replacement in Doors.
Is the PDM replacement complete?
--
Go to Interior Lamps System Check
--
24
Disconnect the left rear door jamb switch connector.
Is the DDM left rear dome/buzzer switch input OFF?
--
Go to Step 25
Go to Step 26
25
Replace the left rear door jamb switch. Refer to Door Lock Actuator Replacement in Doors.
Is the door jamb switch replacement complete?
--
Go to Interior Lamps System Check
--
26
Test CKT 1179 (DK BLU/WHT) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems.
Is there a short to ground in CKT 1179?
--
Go to Step 27
Go to Step 32
27
Replace the rear door module (RDM). Refer to Rear Side Door Window Module Replacement in Doors.
Is the RDM replacement complete?
--
Go to Interior Lamps System Check
--
28
Disconnect the right rear door jamb switch connector.
Is the right rear dome/buzzer switch input off?
--
Go to Step 29
Go to Step 30
29
Replace the right rear door jamb switch. Refer to Door Lock Actuator Replacement in Doors.
Is the door jamb switch replacement complete?
--
Go to Interior Lamps System Check
--
30
Test CKT 1181 (YEL/BLK) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems.
Is there a short to ground in CKT 1181?
--
Go to Step 31
Go to Step 32
31
Replace the RDM. Refer to Rear Side Door Window Module Replacement in Doors.
Is the RDM replacement complete?
--
Go to Interior Lamps System Check
--
32
Repair the faulty wiring. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
--
Go to Interior Lamps System Check

The courtesy lamp supply voltage circuit of the body control module (BCM) supplies battery positive voltage to the dome lamp, the liftgate lamps, and the map lamps. When any door is opened, the door jamb switch contacts close providing a door open input to the BCM. The BCM then provides a ground to the interior lamps with the switch in the AUTO position. The interior lamps receive a ground at G401 with the switch in the ON position.
The following lamps may be manually turned ON by placing the interior lamp switch in the ON position, or by opening a door while the switch is in the AUTO position.
?€¢
The dome lamp

?€¢
The liftgate lamps

?€¢
Courtesy/map lights

You can't turn them on manually ?
This could be a BCM problem , this best left to a ASE certified repair shop or the dealer .

The left and right front door courtesy lamps are controlled, and receive voltage and ground from the drivers door module (DDM) and the passenger door module (PDM) respectively. The body control module (BCM), DDM, and the PDM communicate through class II serial data for the lamp illumination commands and the door ajar switches.
The remaining courtesy lamps are controlled and receive voltage from the BCM. Voltage for the courtesy lamp supply voltage circuit and the backup lamp supply voltage circuit is from the TBC B fuse in the instrument panel fuse block directly through the BCM to these circuits. A short to ground on either of these circuits will open the fuse. Ground is provided to the footwell lamps and all courtesy/reading lamps at G203. Ground is provided to the right middle and right rear door at G306. Ground is provided to the left middle and left rear door at G302.
There could be a DTC - diagnostic trouble code stored in the BCM
DTC B2615
The body control module (BCM) receives a ground signal from the door jamb, liftglass/liftgate if equipped, or courtesy lamp switches requesting courtesy/dome lamp illumination. When this occurs, the BCM directly sends a voltage through the courtesy lamp supply voltage circuit illuminating the courtesy/dome lamps.
Voltage for the courtesy lamp supply voltage circuit as well as the backup lamp supply voltage circuit is from the left instrument panel fuse block TBC 2B 15-amp fuse directly through the BCM to these circuits
DTC B3801
The body control module (BCM) monitors the courtesy lamp switch signal circuit in order to determine when the courtesy/dome lamps should be illuminated. When the BCM senses that the courtesy lamp switch signal circuit is grounded when the switch is activated, the BCM will illuminate the courtesy/dome lamps.
Inspect the following related body control module (BCM), driver door module (DDM), and passenger door module (PDM) data parameters. Refer to Scan Tool Data List or Scan Tool Data Definitions for typical values and definitions:
?€¢
The courtesy lamp switch

?€¢
The interior lamp defeat switch

?€¢
The door ajar switches

Was a problem found?
Go to Step 7
Go to Step 10

The following lamps may be manually turned ON by placing the interior lamp switch in the ON position, or by opening a door while the switch is in the AUTO position.
?€¢
The dome lamp

?€¢
The liftgate lamps

?€¢
Courtesy/map lights

The courtesy lamp supply voltage circuit of the body control module (BCM) supplies battery positive voltage to the dome lamp, the liftgate lamps, and the map lamps. When any door is opened, the door jamb switch contacts close providing a door open input to the BCM. The BCM then provides a ground to the interior lamps with the switch in the AUTO position. The interior lamps receive a ground at G401 with the switch in the ON position.
Important: If the liftgate is opened after all the modules go to sleep, the dome light will not come on. The liftgate ajar switch input to the BCM will not wake up the BCM once it has gone to sleep, so the dome light will not come on. Once the BCM gets an input to wake it up, from remote keyless entry (RKE) or a door handle, the dome light will turn on when the liftgate is opened.
If the driver inadvertently leaves any interior lamp ON, the BCM will turn it OFF after a 20 minute time-out.
The courtesy lamps will turn OFF immediately if the ignition switch is turned to the ON position or approximately 20 seconds after all doors are closed.
The courtesy lamps are controlled by the body control module (BCM). Inputs from the dome lamp switch and the door ajar switches are monitored by the BCM. When a door ajar switch is closed, or the dome lamp switch is turned to the ON position, the BCM supplies the B+ for the courtesy lamps.
With out a factory Tech2 scan tool or equivalent an knowing how these systems work ,you best bet is to take your vehicle to the dealer or some other ASE certified repair shop !

Voltage to the coil of the courtesy lamp relay, dome, reading lamp, courtesy lamps, cargo Lamp, instrument panel (IP) compartment lamp and the underhood lamp is supplied from the Inadvertent power relay on CKT 1732. The inadvertent power relay receives voltage from the CTSY LP fuse which is hot at all times. Ground for the courtesy lamps goes through the courtesy lamp relay. Both relays are controlled by the body control module (BCM) based on inputs from door jamb switch, dome lamp switch or door handle switch. The BCM will supply a ground to the courtesy lamp relay when closing any one of the above switches to ground. Ground for the reading lamp, cargo lamp, IP compartment lamp and the underhood lamp is supplied by its own ground.

Does the van have remote keyless entry (RKE) system ?
Interior Lighting System Description
Vehicles with the optional remote keyless entry (RKE) system have interior lighting controlled by the body control module (BCM).
This vehicle uses a delayed interior lighting system.
The system functions as follows:
• The dome lamps will illuminate when any door is opened.
• The dome lamps will remain on for 20 seconds after the last door is closed.
• The delay is canceled and the dome lamps will go out when the ignition switch is turned to the ON position.
• The illuminated entry function will not operate when the dome lamp defeat switch is in the OFF position.
• The interior lighting system is protected from battery rundown by the retained accessory power (RAP) system. The RAP system functions by shutting down interior lights after 10 minutes (when ignition is OFF).

Interior Lights Circuit Description
When the interior lamps circuits are closed/enabled, the courtesy lamp relay is activated by the two following coil circuits:
• CKT 690 (GRY/BLK) which is the courtesy lamp enable output of the body control module (BCM) driving the coil side of the relay.
• CKT 1732 (ORN) which is the coil output side of the relay going to the potential grounding switches/sources.
When the courtesy lamp relay is enabled, CKT 156 (WHT) (courtesy lamp output) is enabled by the closed contact at the relay and then grounded by CKT 750 (BLK) at G110.
Some of these circuits can also be activated with the headlamp and panel dimmer switch. When this happens, the coil output side of the inadvertent power relay is grounded to the body control module (BCM) via CKT 1393 (DK BLU)
CKT 40 (ORN) from the courtesy fuse drives both input sides of the inadvertent power relay. When the contact is pulled closed, CKT 1732 (ORN) is supplied power, thus driving any lamps/circuits attached that circuit and providing ground.
The body control module (BCM) also monitors the following four door inputs:
• CKT 49 (DK BLU) -- LH door jamb switch input
• CKT 54 (ORN) -- RH door jamb switch input
• CKT 775 (PNK) -- Side door jamb switch input
• CKT 656 (YEL) -- Rear door jamb switch input/liftgate strut switch input (depending on option content)
When the doors are closed, the body control module (BCM) is in a floating state of 0-2 volts. When the doors are opened, the courtesy lamp relay is activated, sending power to the courtesy lamps.
The headlamp and panel dimmer switch also activates the following interior courtesy lamps when the switch is placed in the PARK or HEADLAMP ON positions:
• RF power window switch
• RH power door lock switch
• LH power window switch
• LH power door lock switch
• LH outside rearview mirror control switch
• Rear radio control head
The dome lamps can be disabled by closing the dome lamp defeat switch located on the headlamp and panel dimmer switch.

--------------------------------------------------------------------------------
Courtesy or Dome Lamps Inoperative
Step
Action
Value(s)
Yes
No
Important: Verify functional bulbs before beginning diagnostic procedure.
1
Did you perform the Lighting Diagnostic System Check?
--
YES - Go to Step 2
NO - Go to Diagnostic System Check - Lighting Systems
2
Are all of the courtesy/dome lamps inoperative?
--
YES - Go to Step 6
NO - Go to Step 3
3
Activate courtesy/dome lamps
With DMM, check for battery voltage from inoperative lamp CKT 1732 (ORN) to ground
Is battery voltage present?
B+
YES - Go to Step 4
NO - Go to Step 5
4
Repair open in CKT 156 (WHT) between inoperative lamp assemply and S214.
Is the repair complete?
--
NO - Go to Step 10
--
5
Repair open in CKT 1732 (ORN) between inoperative lamp assemply and one of the following splices:
• S258
• S301
Is the repair complete?
--
Go to Step 10
--
6
Turn the courtesy lamp switch to the ON position
Check for battery voltage at BCM C2 cavity B12.
Is battery voltage present?
B+
Go to Step 7
Go to Diagnostic System Check - Body Control System in Body Control Systems
7
Verify continuity of the following three circuits with DMM:
• CKT 1732 (ORN) between courtesy lamp relay and body control module
• CKT 156 (WHT) between courtesy lamp relay and S214
• CKT 750 (BLK) between courtesy lamp relay and S206
Are all of the circuits functional?
--
Go to Step 8
Go to Step 9
8
Replace courtesy lamp relay.
Is repair complete?
--
Go to Step 10
--
9
Repair the inoperative circuit.
Is the repair complete?
--
Go to Step 10
--
10
Operate the system in order to verify the repair.
Did you correct the condition?
--
System OK
Go to Step 2

the actuator for the dome light is actually located inside the lock mechanism. Have you checked to make sure the dome light override button is in the out position?

Interior Lights Circuit Description
By using a feature called inadvertent power control, the body control module (BCM) supplies power to all of the following components:
• The courtesy lamps
• The dome lamps
• The rear view mirror reading lamps
• The instrument panel compartment lamp
• The rear compartment lamp
The left front door ajar switch turns the interior lamps on through the BCM by grounding CKT 394. When the left front door is open, the switch is closed. This condition provides a ground and a door open input to the BCM. The BCM then grounds the following lamps through CKT 156 in order to turn the lamps on:
• The courtesy lamps
• The dome lamp
• The rearview mirror lamps
The right front door ajar switch and the rear door ajar switches turn the interior lamps on by grounding CKT 395 from the BCM.
When the ignition key is removed from the lock cylinder, the interior lamps remain on for approximately 40 seconds.
The BCM provides an interior lamps-on delay after a door is opened. The lamps remain on for approximately 40 seconds or until the ignition switch is turned to the ON position. The 40 second lamps-on delay reduces to 4 seconds if a door is opened within 2 minutes of the ignition switch being moved from the ON position. The interior lamps immediately turn off when the vehicle begins to move.
The dome lamp OFF-DOOR-ON switch controls the dome lamp. When the switch is in the OFF position, the dome lamp remains off. When the switch is in the DOOR position, the dome lamp lights when a door is opened by the BCM grounding CKT 156. When the switch is in the ON position, ground is supplied through CKT 750. The rear view mirror reading lamps are controlled by the rear view mirror reading lamps switch or through CKT 156 from the BCM.
Voltage is supplied at all times to the BCM through the INT LPS fuse. The BCM supplies voltage to the interior lamps through CKT 1732.

Battery Run Down Protection
When the ignition switch is in the OFF position, the BCM turns off the power to all of the interior lamps after 18-22 minutes.
The BCM will reset the inadvertent power control relay output when one of the following actions is performed:
• Open or close a door.
• Turn the ignition switch to the ON position.
• Turn off any interior lamps that may be on.
• Press the power door lock switch/keyfob button.
• Press the decklid release keyfob button.

Courtesy or Dome Lamps Always On
Step
Action
Yes
No
1
Did you perform the Lighting Systems Diagnostic System Check?
YES - Go to Step 2
NO - Go to Diagnostic System Check - Lighting Systems
2
Use the Scan Tool in order to command the courtesy lamps OFF.
Do the courtesy lamps turn OFF?
YES - Go to Step 4
NO - Go to Step 3
3
Test for a short to ground in the courtesy lamps control circuit (156). Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
YES - System OK
NO - Go to Step 7
4
Test for a short to ground in each door jamb switch circuit:
• Circuit 394-Driver door
• Circuit 395-Passenger door(s).
Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
YES - System OK
NO - Go to Step 5
5
Test each door jamb switch for proper operation. Refer to the following:
• Open switch with the door closed
• Closed switch with the door open
Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find a malfunctioning door jamb switch?
YES - Go to Step 6
NO - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
6
Replace the malfunctioning door jamb switch. Refer to Door Jamb Switch Replacement in Doors.
YES - Is the repair complete?
NO - System OK
--
7
Important: Perform the set up procedure for the body control module.
Refer to Body Control Module (BCM) Programming/RPO Configuration .
Replace the body control module. Refer to Body Control Module Replacement in Body Control System.
Did you complete the replacement?
System OK
Instal the door jamb switch wire harness.
Install the door jamb switch (2).

Why didn't you hook into the entertainment system (radio ) ?
The one that turns on when the door opens is controlled by the BCM -body control module .You probably shorted out the transistor in side the BCM .
These lamps may be manually turned on by placing the interior lamp switch in the ON position, or by opening a door.
• The Dome Lamp
• The Rear Compartment Courtesy Lamp
• The Rear View Mirror Map Lights
The inadvertent power control circuit of the BCM supplies battery positive voltage to the dome lamp and the map lamps. When any door is opened, the door jamb switch contacts close providing a door open input to the BCM. The BCM then provides a ground to the interior lamps. The interior lamps receive a ground at G401 or G403.
If the driver inadvertently leaves any interior lamp on the BCM will turn it off after a 20 minute time-out.
The courtesy lamps will normally turn off using the theater dimming feature. The BCM provides a pulse width modulated ground to the interior lamps for the theater dimming feature. The courtesy lamps will also turn off immediately if a door lock command is received with all the doors closed, or if the ignition switch is turned to the ON position.

--------------------------------------------------------------------------------
Dome Lamps Inoperative
ematic Reference: Interior Lights Schematics
DEFINITION: Only the dome lamp is inoperative.
1
Did you perform the Diagnostic System Check - Vehicle?
YES - Go to Step 2
NO - Go to Diagnostic System Check - Vehicle
2
Place the instrument panel (I/P) dimmer switch in the DOME position.
Does the dome lamp illuminate?
YES - Go to Testing for Intermittent Conditions and Poor Connections
NO - Go to Step 3
3
Disconnect the dome lamp assembly.
Probe the courtesy lamp supply voltage circuit with a test lamp that is connected to a good ground.
Does the test lamp illuminate?
YES - Go to Step 4
NO - Go to Step 6
4
Connect the test lamp between the courtesy lamp supply voltage circuit and the courtesy lamp low control circuit.
Does the test lamp illuminate?
YES - Go to Step 5
NO - Go to Step 7
5
Inspect for poor connections at the harness connector of the dome lamp assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?
YES - Go to Step 9
NO - Go to Step 8
6
Repair an open, high resistance, or short to ground in the courtesy lamp supply voltage circuit. Refer to Circuit Testing and Wiring Repairs .
YES - Did you complete the repair?
NO - Go to Step 9
--
7
Repair an open or high resistance in the courtesy lamp low control circuit. Refer to Circuit Testing and Wiring Repairs .
YES - Did you complete the repair?
NO - Go to Step 9
--
8
Replace the dome lamp assembly. Refer to Dome Lamp Replacement .
YES - Did you complete the replacement?
NO - Go to Step 9
--
9
Operate the system in order to verify the repair.
Did you correct the condition?
YES - System OK
NO - Go to Step 3