Question about 2002 Chevrolet Blazer

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Instrument light dimmer inop

The instrument lights only come on in the "full on" (turn the overhead interior light on mode).

All the interior lights work, headlamps, backup lights...no other symptom.

I checked the manual for a possible fuse connection, but didn't find that specific link.

Suggestions?

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  • 104 Answers

Sounds like the dimmer is at fault. It's a dealer item, but call them and order one. Should be sold seperately, and isn't too expensive. Ask for an instrument panel dimmer (switch) for your particular year, etc. Thanks, TT

Posted on Feb 23, 2009

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Posted on Jan 02, 2017

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What is the fuse number for the dashboard lights on a 2007 Ford Focus 3 door hatchback?


Principles of Operation
The instrument cluster and panel illumination consists of dimmable and non-dimmable illumination components. The dimmable illumination is controlled by the instrument panel dimmer switch, which allows the brightness level of the backlights to be adjusted to the customer preferences. With the parking lamps ON, the instrument panel dimmer switch uses electronic circuitry to provide a variable pulse width modulated (PWM) output to the instrument panel and all applicable switches depending on the driver-controlled level of intensity. The headlamp switch backlighting consists of 2 constantly illuminated LED bulbs that are powered by separate circuits. Battery voltage is supplied to the first bulb when the ignition switch is in the RUN position. Battery voltage is supplied to the second bulb with the parking lamps ON. The non-dimmable illumination allows for full intensity dependant on the ignition switch position.

Inspection and Verification
  1. Verify the customer concern.
  1. Visually inspect for obvious signs of mechanical or electrical damage.


Visual Inspection Chart Mechanical Electrical
  • Headlamp switch
  • Instrument panel dimmer switch
  • Circuitry
  • Connector(s)
  • Headlamp switch
  • Instrument panel dimmer switch
  • Illumination source(s)

  1. If an obvious cause for an observed or reported concern is found, correct he cause (if possible) before proceeding to the next step.
  1. If the cause is not visually evident, verify the symptom and GO to Symptom Chart .

Symptom Chart
Symptom Chart Condition Possible Sources Action
  • The control illumination is inoperative
  • Headlamp switch
  • Circuitry
  • Go To Pinpoint Test A .
  • The instrument cluster illumination is inoperative
  • Circuitry
  • Instrument cluster
  • Go To Pinpoint Test B .
  • The climate control panel illumination is inoperative
  • Circuitry
  • Climate control panel
  • Go To Pinpoint Test C .
  • The audio unit illumination is inoperative
  • Circuitry
  • Audio unit
  • Go To Pinpoint Test D .
  • The transmission control lever illumination is inoperative
  • Circuitry
  • Transmission control lever illumination bulb
  • Go To Pinpoint Test E .
  • The hazard warning switch illumination is inoperative
  • Circuitry
  • Hazard warning switch
  • Go To Pinpoint Test F .
  • The traction control switch illumination is inoperative
  • Circuitry
  • Traction control switch
  • Go To Pinpoint Test G .
  • The window control switch illumination is inoperative
  • Circuitry
  • Window control switch
  • VERIFY the operation of the window control switch in question. If the window control switch is inoperative, REFER to Section 501-11 . If the window control switch operates correctly, INSTALL the new window control switch in question. REFER to Section 501-11 .
  • The instrument panel illumination does not dim
  • Headlamp switch
  • Circuitry
  • Go To Pinpoint Test H .

Pinpoint Test B: The Instrument Cluster Illumination Is Inoperative
Normal Operation A variable pulse width modulated (PWM) voltage is supplied to the instrument cluster through circuit 29S-LA31 (OG/BU). The instrument cluster is grounded through circuit 91-GG14 (BK/OG).
    Possible Causes
  • circuit 29S-LA31 (OG/BU) open
  • circuit 91-GG14 (BK/OG) open
  • instrument cluster
PINPOINT TEST B: THE INSTRUMENT CLUSTER ILLUMINATION IS INOPERATIVE CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.

Sep 24, 2017 | Ford Cars & Trucks

1 Answer

Fuse location for interior lighting 2007 f150 fxt4x4 also is there 2 dash lights it doesn't seem to be as bright as it used to


dash lights it doesn't seem to be as bright as it used to ???? Dimmer switch on full bright ? Visual Inspection Chart Electrical
  • Bulbs
  • Central junction box (CJB) fuse 24 (15A)
  • Circuitry
  • Vehicle security module (if equipped with RKE)
  • Instrument cluster
  • Door ajar switches

Interior Lighting The interior lamp system is separated into 2 subsystems: the interior lamp subsystem and the on-demand lamp subsystem. The dome light and front map light on-demand lamps are also part of the interior lamp subsystem.
An on-demand interior lamp will only illuminate when its specific switch is activated. On-demand lamps consist of the front map light and the dome light.
The instrument cluster illuminates the interior lamps when any door is ajar, when an unlock signal is received by the vehicle security module (if equipped with remote keyless entry (RKE) or the dimmer switch is rotated to the ON position. The instrument cluster will turn off the interior lamps when all doors are closed, the vehicle security module (if equipped with RKE) receives a lock signal, 25 seconds have elapsed since the illuminated entry feature was activated, or the dimmer switch is rotated to the OFF position.
The vehicle is also equipped with a battery saver feature. The battery saver feature provides automatic shutoff of the demand lamps, courtesy lamps, and the warning chimes after a specific period of time has elapsed in order to save battery power.

  1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  1. If the cause is not visually evident, connect the diagnostic tool to the data link connector (DLC) and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
    • check that the program card is correctly installed.
    • check the connections to the vehicle.
    • check the ignition switch position.
  1. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
  1. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
    • CAN, ISO or UBP circuits fault; all electronic control units no response/not equipped, refer to Section 418-00 .
    • No response/not equipped for instrument cluster, refer to Section 413-01 .
    • No response/not equipped for vehicle security module, refer to Section 419-10 .
    • System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out the self-test diagnostics for the instrument cluster.
    • System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out the self-test diagnostics for the vehicle security module.
  1. If the DTCs retrieved are related to the concern, go to the Instrument Cluster Diagnostic Trouble Code (DTC) Index or the Vehicle Security Module Diagnostic Trouble Code (DTC) Index.
  1. If no DTCs related to the concern are retrieved, GO to Symptom Chart .
  2. Symptom Chart Condition Possible Sources Action
    • The interior lamps are inoperative
    • Fuse
    • Circuitry
    • Instrument cluster
    • Dimmer control switch
    • Go To Pinpoint Test A .
    Pinpoint Test A: The Interior Lamps Are Inoperative
    Normal Operation On vehicles equipped with remote keyless entry (RKE), the door ajar switches are hardwired to the vehicle security module. The vehicle security module monitors the status of all door ajar switches, and when a door is opened, transmits a dome lamp ON signal to the instrument cluster through UART based protocol (UBP) circuit 1906 (PK), indicating a door has been opened. When the instrument cluster receives the dome lamp ON signal from the vehicle security module, the instrument cluster energizes the interior lamp circuits, which illuminates the interior lamps and, if equipped, the puddle lamps in the exterior mirrors.
    On vehicles without RKE, the door ajar switches are hardwired to the instrument cluster. When the driver or passenger door is opened, the instrument cluster receives a ground signal from the driver door ajar switch through circuit 344 (BK/YE), or from the passenger door ajar switch through circuit 345 (BK/PK), and the instrument cluster energizes the interior lamp circuits, causing the interior lamps to illuminate.
    The dimmer control switch can be used to turn the interior lamps ON or OFF when the doors are closed. The interior lamp defeat switch can be used to turn the interior lamps OFF when the doors are open.
      Possible Causes
    • Fuse
    • Circuit 53 (BK/LB) open or short to ground
    • Circuit 57 (BK) open
    • Circuit 402 (OG/LG) open
    • Circuit 1405 (LB/BK) short to ground
    • Circuit 3049 (BK/LG) open
    • Dimmer control switch
    • Instrument cluster
    PINPOINT TEST A: THE INTERIOR LAMPS ARE INOPERATIVE
  3. PINPOINT TEST A: THE INTERIOR LAMPS ARE INOPERATIVE Test Step Result / Action to Take A1 CHECK THE INTERIOR LAMP OPERATION AT THE DIMMER CONTROL SWITCH
    • Close all doors.
    • Operate the interior lamps with the instrument panel dimmer control switch.
    • Do any interior lamps illuminate?
    Yes
    For vehicles without RKE, REFER to Section 413-01 .

    For vehicles with RKE, REFER to Section 419-10 .

    No
    GO to A2 . A2 CHECK FOR INSTRUMENT CLUSTER OR VEHICLE SECURITY MODULE DIAGNOSTIC TROUBLE CODES (DTCs)
    • Key in ON position.
    • Carry out the instrument cluster On-Demand Self Test.
    • For vehicles equipped with remote keyless entry (RKE), carry out the vehicle security module On-Demand Self Test.
    • Were instrument cluster DTCs B2499 or B2659, or if equipped with RKE, vehicle security module DTC U1950 present?
    Yes
    For instrument cluster DTC B2499, GO to A5 .

    For instrument cluster DTC B2659, GO to A9 .

    If equipped with RKE and vehicle security module and DTC U1950 is present, REFER to Section 418-00 to diagnose the UBP network concern before attempting to diagnose the interior lighting concern.

    No
    GO to A3 . A3 CHECK CIRCUIT 3049 (BK/LG) FOR AN OPEN
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220b.
    • Measure the voltage between the instrument cluster C220b-9, circuit 3049 (BK/LG), harness side and ground.
    • Is the voltage greater than 10 volts?
    Yes
    GO to A4 .

    No
    VERIFY the central junction box (CJB) fuse 21 (15A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation. A4 CHECK INSTRUMENT CLUSTER CIRCUIT 57 (BK) FOR AN OPEN
    • Disconnect: Instrument Cluster C220a.
    • Measure the resistance between the instrument cluster C220a-17, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms?
    Yes
    GO to A5 .

    No
    REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. A5 CHECK CIRCUIT 53 (BK/LB) FOR AN OPEN
    • NOTE: If the fuse fails, repair circuit 53 (BK/LB) for a short to ground.
    • Connect a fused (15A) jumper wire between the instrument cluster C220b-9, circuit 3049 (BK/LG), harness side and the instrument cluster C220b-8, circuit 53 (BK/LB), harness side.
    • Do the interior lamps illuminate?
    Yes
    REMOVE the jumper wire. GO to A6 .

    No
    REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. A6 CHECK THE DIMMER CONTROL SWITCH OPERATION
    • Connect: Instrument Cluster C220a.
    • Disconnect: Dimmer Control Switch C205b.
    • Connect a fused (15A) jumper wire between the dimmer control switch C205b-4, circuit 57 (BK) and the dimmer control switch C205b-2, circuit 402 (OG/LG).
    • Do the interior lamps operate?
    Yes
    INSTALL a new dimmer control switch. REFER to Section 417-01 . TEST the system for normal operation.

    No
    GO to A7 . A7 CHECK CIRCUIT 402 (OG/LG) FOR AN OPEN
    • Disconnect: Instrument Cluster C220a.
    • Measure the resistance between the instrument cluster C220a-12, circuit 402 (OG/LG), harness side and the dimmer control switch C205b-2, circuit 402 (OG/LG), harness side.
    • Is the resistance less than 5 ohms?
    Yes
    GO to A8 .

    No
    REPAIR the circuit. TEST the system for normal operation. A8 CHECK DIMMER CONTROL SWITCH CIRCUIT 57 (BK) FOR AN OPEN
    • Measure the resistance between the dimmer control switch C205b-4, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms?
    Yes
    GO to A11 .

    No
    REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. A9 CHECK CIRCUIT 1405 (LB/BK) FOR A SHORT TO GROUND
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220a.
    • Disconnect: Dimmer Control Switch C205b.
    • Measure the resistance between the instrument cluster C220a-11, circuit 1405 (LB/BK), harness side and ground.
    • Is the resistance greater than 10,000 ohms?
    Yes
    GO to A10 .

    No
    REPAIR the circuit. TEST the system for normal operation. A10 CHECK THE DIMMER CONTROL SWITCH
    • Carry out the dimmer control switch component test. Refer to Wiring Diagrams Cell 149 for schematic and connector information.
    • Is the dimmer control switch OK?
    Yes
    GO to A11 .

    No
    INSTALL a new dimmer control switch. TEST the system for normal operation. A11 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
    • Disconnect all instrument cluster connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all instrument cluster connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present?
    Yes
    INSTALL a new instrument cluster. REFER to Section 413-01 . TEST the system for normal operation.

    No
    The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation

Jul 19, 2017 | Cars & Trucks

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How do I replace dash light bulbs on a 2007 Ford Escape?


What lights are not working ? The instrument cluster illumination is inoperative or all the lights ,radio , heater control head, all the switches that would be back lighted.
  • The climate control panel illumination is inoperative , The passenger door lock control switch illumination is inoperative. Could need new dimmer switch , new instrument cluster. When installing a new instrument cluster, it is necessary to upload the module configuration to the scan tool. Following installation of the new instrument cluster, download the module configuration from the scan tool into the new instrument cluster. Refer to Section 418-01 .
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    Wiring diagram for a 1994 olds cutlass supreme instrument lights


    Power comes from headlamp / dimmer switch . Go here for free wiring diagrams http://bbbind.com/free_tsb.html Enter vehicle info year ,make , model ,engine size ! Under system click on lighting then under subsystem click interior light dimming .

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    Instrument Panel Lights


    Daytime headlight issue ? No , no sensor behind the front bumper . No Daytime time head lamp issue , doesn't turn on the instrument panel light's . This is more then likely a remote dimmer module problem .
    Interior Lights Dimming Circuit Description (Pontiac)
    When the park lights are on, battery positive voltage (B+) is applied via CKT 32 (YEL) to the remote dimmer module. The interior dimming switch in the lamp dimmer switch is a variable resistor which applies the dimming input via CKT 44 (DK GRN) to the remote dimmer module. The potentiometer in the lamp dimmer switch cannot provide enough current in order to operate the incandescent lights. The remote dimmer module amplifies the current, applying a variable voltage to the incandescent lights. As the amount of current increases, the lamps become brighter. As the amount of current decreases, the lamps become dimmer.
    The radio, heater and A/C control assembly, instrument cluster, and passenger climate control each has a vacuum fluorescent (VF) display. When each module receives an input that the ignition switch is turned to the RUN position, each module activates the VF display at the full intensity. When the park lights are on, the radio receives the dimming level from an input on CKT 8 (GRY). The radio then relays this information to any other modules with VF displays. All modules with VF displays then adjust the dimming level of their VF display in order to match the level of the incandescent lamps.

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    I have a 2002 Chevy Avalanche 2500 with dash lights out. Not only did these lights go out but the power locks also stopped working at about the same time. Not sure if that is coincidence or what. All the...


    Factory repair manual step by step testing procedure for Interior Backlighting Inoperative. In your course of testing let me know if you need location for anything .

    2
    Turn ON the parklamps.
    Ensure the panel dimmer switch is at maximum illumination.
    Do the illumination lamps operate normally?
    YES - Go to Testing for Electrical Intermittents in Wiring Systems
    NO - Go to Step 3
    3
    Is only one lamp inoperative?
    YES - Go to Step 4
    NO - Go to Step 6
    4
    Test the instrument panel lamp supply voltage circuit of the inoperative lamp for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
    Did you find and correct the condition?
    YES - Go to Step 17
    NO - Go to Step 5
    5
    Test the ground circuit of the inoperative lamp for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
    Did you find and correct the condition?
    YES - Go to Step 17
    NO - Go to Step 11
    6
    Do the park lamps function properly?
    YES - Go to Step 7
    NO - Go to Park Lamps Inoperative
    7
    Inspect the ILLUM fuse.
    Is the fuse open?
    YES - Go to Step 12
    NO - Go to Step 8
    8
    Ensure the panel dimmer switch is at maximum illumination.
    Connect a test lamp between the ILLUM fuse and ground.
    Does the test lamp illuminate?
    YES - Go to Step 14
    NO - Go to Step 9
    9
    without disconnecting the switch, connect a test lamp between the instrument panel lamps dimmer switch signal circuit at the headlamp and panel dimmer switch and ground.
    Does the test lamp illuminate?
    YES - Go to Step 13
    NO - Go to Step 10
    10
    Inspect for poor connections at the harness connector of the headlamp and panel dimmer switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
    Did you find and correct the condition?
    YES - Go to Step 17
    NO - Go to Step 16
    11
    Inspect for poor connections at the harness connector of the inoperative bulb. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
    Did you find and correct the condition?
    YES - Go to Step 17
    NO - Go to Step 15
    12
    Repair the short to ground in the instrument panel lamp supply voltage circuit. Refer to Wiring Repairs in Wiring Systems.
    Replace the fuse.
    YES - Did you complete the repair?
    NO - Go to Step 17
    --
    13
    Repair the open in the instrument panel lamps dimmer switch signal circuit between the switch and the fuse. Refer to Wiring Repairs in Wiring Systems.
    Did you complete the repair?
    Go to Step 17
    --
    14
    Repair the open in the instrument panel lamp supply voltage circuit. Refer to Wiring Repairs in Wiring Systems.
    Did you complete the repair?
    Go to Step 17
    --
    15
    Replace the inoperative bulb.
    Did you complete the replacement?
    Go to Step 17
    --
    16
    Replace the headlamp and panel dimmer switch. Refer to Headlamp Switch Replacement .
    Did you complete the replacement?
    Go to Step 17
    --
    17
    Operate the system in order to verify the repair.
    Did you correct the condition?
    System OK
    Go to Step 3

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