Have a 1997 Park Avenue that the interior lights will not come on. Reading lamps do not come on with their switches either. Rear defogger also doesn't work. Have checked fuses/relays in all three fuse blocks that I thought were related, none were bad. Wound't say it's a door switch because lights will not come on with any door open. Please help.

STOP and PARK LPS will be tail lights.

ILLUM and GAUGES will.be dash lights.



STOP
Stop/CHMSL, Stoplamps

GAUGES
IP Cluster, DRL Relay, DRL Module, HDLP Switch, Keyless Entry Illumination, Low Coolant Module, CHIME Module, DRAB Module

PARK LPS
License Plate Lamp, Parking Lamps, Taillamps, Front Sidemarkers, Glove Box Ashtray

ILLUM
LP Cluster, HVAC Controls, RR HVAC Controls, IP Switches, Radio Illumination, Door Switch Illumination

Your best bet , take it to a qualified repair shop .
SMART ENTRANCE CONTROL UNIT PFP:28596 Description EKS003A2 OUTLINE The smart entrance control unit totally controls the following body electrical system operations. ? Warning chime ? Rear window defogger and door mirror defogger ? Power door locks ? Remote keyless entry system ? Vehicle security system ? Interior lamp ? Battery saver control BATTERY SAVER CONTROL Interior Lamp/Map Lamp/Vanity Lamps The lamps turn off automatically when the interior lamp, map lamp or/and vanity lamps are illuminated with the ignition key in the OFF position, if the lamp remains lit by the door switch open signal or if the lamp switch is in the ON position for approximately 10 minutes. After lamps are turned off by the battery saver system, the lamps illuminate again when: ? Driver's door is locked or unlocked, ? Door is opened or closed, ? Key is inserted into or removed from the ignition key cylinder. Rear Window Defogger/Door Mirror Defogger Rear window defogger and door mirror defogger are turned off approximately 15 minutes after the rear window defogger switch is turned on. INPUT/OUTPUT

Warning chime Key switch (Insert) Ignition switch (ON) Lighting switch (1st or 2nd) Seat belt buckle switch LH Front door switch LH Warning chime (located in smart entrance control unit)

Nothing for you to remove ! Without a factory scan tool U can do nothing .
TIME CONTROL UNIT PFP:28491 Description (Without Power Door Locks) EKS003A6 OUTLINE The time control unit totally controls the following body electrical system operations. ? Warning chime ? Rear window defogger INPUT/OUTPUT System Input Output Warning chime Key switch (Insert) Ignition switch (ON) Lighting switch (1st or 2nd) Seat belt buckle switch LH Front door switch LH Warning chime (located in time control unit) Rear window defogger Ignition switch (ON) Rear window defogger switch Rear window defogger relay

SMART ENTRANCE CONTROL UNIT PFP:28596 Description EKS003A2 OUTLINE The smart entrance control unit totally controls the following body electrical system operations. ? Warning chime ? Rear window defogger and door mirror defogger ? Power door locks ? Remote keyless entry system ? Vehicle security system ? Interior lamp ? Battery saver control BATTERY SAVER CONTROL Interior Lamp/Map Lamp/Vanity Lamps The lamps turn off automatically when the interior lamp, map lamp or/and vanity lamps are illuminated with the ignition key in the OFF position, if the lamp remains lit by the door switch open signal or if the lamp switch is in the ON position for approximately 10 minutes. After lamps are turned off by the battery saver system, the lamps illuminate again when: ? Driver's door is locked or unlocked, ? Door is opened or closed, ? Key is inserted into or removed from the ignition key cylinder. Rear Window Defogger/Door Mirror Defogger Rear window defogger and door mirror defogger are turned off approximately 15 minutes after the rear window defogger switch is turned on.

Warning chime Key switch (Insert) Ignition switch (ON) Lighting switch (1st or 2nd) Seat belt buckle switch LH Front door switch LH Warning chime (located in smart entrance control unit)

Does it have power locks ?

TIME CONTROL UNIT PFP:28491 Description (Without Power Door Locks) EKS003A6 OUTLINE The time control unit totally controls the following body electrical system operations. ? Warning chime ? Rear window defogger INPUT/OUTPUT System Input Output Warning chime Key switch (Insert) Ignition switch (ON) Lighting switch (1st or 2nd) Seat belt buckle switch LH Front door switch LH Warning chime (located in time control unit) Rear window defogger Ignition switch (ON) Rear window defogger switch Rear window defogger relay

Your vehicle use's three module's that make up the body control system .
Body Control System Operation
Each of the 3 body control modules integrate a number of functional systems under the control of a single module. Each of the modules is connected to the Class 2 serial data line. Many control signals are implemented by Class 2 messages.
Dash Integration Module (DIM)
The DIM functions include the following functions:
• Power moding control (ignition switch states) over Class 2 serial data line
• Control of headlights and exterior lamps
• Interior lamps incandescent dimming
• Steering wheel controls
• Horn relay control for theft activation
• Lamps On signal with wiper/washer
• Low side temperature for HVAC compressor
• Cooling fan control (power - train cooling)
• Incandescent dimming of dash bulbs control
• Real time clock time keeper
• Battery voltage sense and load management
• Reverse lockout solenoid control
Instrument Panel Module (IPM)
The IPM functions include the following functions:
• Front HVAC air delivery and temperature controls
• Ambient light sensor input and twilight delay input for headlights control
• IP dimmer switch input
• Traction control switch input
• Interior lamps switch input
• Key in ignition switch input from the ignition switch
• Rear compartment lid release switch input
• Ignition switch headlight control
Rear Integration Module (RIM)
The RIM functions include the following functions:
• Heated seat controls
• Rear defogger control
• Park relay controls
• Various controls for the interior lamps
• Reverse control for the backup lamps
• Rear compartment lid release controls
• Retained Accessory Power (RAP) control
• Ajar switch and tamper switch inputs from the rear compartment lid
• Vehicle leveling
Your best bet , take your vehicle to a qualified repair shop , before you cause unnecessary problem's an repair's .

Fuse Usage 1 Climate Control 2 (HVAC) 2 Compass 3 Ignition Switch, Theft Deterrent System Module (PK3) 4 Upfitter Courtesy Lamps 5 Climate Control 1 (HVAC) 6 Empty 7 Instrument Panel Cluster 8 Audio System, Chime 9 Auxiliary Park Lamp 10 Auxiliary Trailer Back-up Lamps 11 Remote Function Actuator, Tire Pressure Monitor (TPM) 12 Climate Control (HVAC) Controls 13 Trailer Park Lamps 14 Front Park Lamps 15 Taillamps, Back-up Lamps 16 Empty 17 Steering Wheel Sensor 18 Outside Rearview Mirror Switch 19 Empty 20 Empty 21 Rear Defogger 22 Outside Rearview Mirror Heater 23 Empty 24 Empty 25 Cargo Door Unlock 26 Rear Door Lock 27 Front Door Lock 28 Rear Passenger Door Unlock 29 Upfitter Park Lamps 30 Front Passenger Door Unlock 31 Driver Door Unlock 32 Airbag System, Automatic Occupant Sensing (AOS) System 33 Right Rear Park Lamp 34 Left Rear Park Lamp 35 Upfitter Auxiliary 2 (J-Case) 36 Upfitter Auxiliary 1 (J-Case) 37 Rear Blower (J-Case) 38 Empty (J-Case) 39 Run (High Current Micro) 40 Park Lamps (High Current Micro) 41 Empty (Mini Micro) 42 Upfitter Auxiliary 2 (High Current ISO Relay) 43 Retained Accessory Power (RAP) (High Current Micro) 44 Rear Defogger (High Current Micro)

Could be a bad relay !
The rear defogger circuit is protected by a 40A fuse. Voltage is supplied through the fuse to the rear defogger relay. When you press the rear defogger switch, the heater and A/C programmer sends a class 2 message to the body control module (BCM), to ground the rear defogger relay coil output circuit. This in turn closes the relay contacts allowing current to the rear window grid.
Do you know what a class 2 message is ? What a BCM is ?
HTD BK relay in rear fuse box ,location In the center right rear of the passenger compartment, under the rear seat cushion
Watch this video on testing from relay base ( where it plug's into )
Do
VEHICLE RELAYS Testing from the relay base

if its just the lights its not a fusible link, ck all the fuses including cig lighter

There are 3 areas the fuse could be.

Under the hood (unlikeley)
Under the rear seat (more likely)
Behind the instrument panel (probably not)

But I would check all three if possible.

your owner manual sould have fuse chart. Some fuses/ekays in enine compartment. Some in car on left side of instrument panel

in car


Fuse Amps Circuits Protected 1 10 Power Mirrors, Anti-Theft Warning Light, Diagnostic Connector 2 5 Generic Electronic Module, Start Interrupt Relay Coil 3 5 Radio Illumination, Remote Radio Illumination, Electronic Instrument Cluster, Electronic Instrument Cluster PRNDL Illumination, Electronic Instrument Cluster Switch Module, Analog Cluster Illumination, Instrument Illumination 4 — Not Used 5 — Not Used 6 15 Rear Quarter Windows (LH and RH) 7 15 High Mounted Stoplamp, Brake Shift Interlock 8 25 Subwoofer, JBL Amplifier 9 10 Park and Turn Lamps, Side Marker Lamps, License Lamps, Stop Lamps 10 2 High Beam Indicator Electronic Cluster 11 15 Park Lamps 12 10 Remote Radio, Auxiliary Warning Lamp Module, Remote Keyless Entry (RKE) Module, Anti-Theft Controller Module, Radio Illumination 13 15 Radio, CD Disc Changer 14 5 Electronic Chromatic Mirror, Analog Cluster Indicator Lamps, Air Bag Module 15 — Not Used 16 15 Horns, Horn Relay Coil 17 15 Fog Lamps 18 25 Front Wiper Motor, Front Washer Pump, Wiper/Washer Relays 19 10 Generic Electronic Module (Pin 57), Electronic Instrument Cluster 20 25 Integrated Relay Control Module, Ignition Coil 21 10 Air Bag Module, Rear Window Defrost Relay, A/C Clutch, Temp Blend Door Actuator, Brake Shift Interlock 22 20 Rear Cigar Lighter, Power Plug 23 15 Multi-Function Switch 24 20 Rear Wiper Motor, Rear Washer Pump 25 10 Turn Signal Lamps, Instrument Cluster Turn Indicator 26 15 LH Aero Headlamp, Left and Right Trailer Stop/Turn/Hazard 27 15 Hazard Warning Lamps, Instrument Cluster Turn Indicator 28 15 Instrument Panel Cigar Lighter 29 15 Battery Saver Relay, Interior Lamp Control Relay, Interior Lamps, RH and LH Keyhole Lamps 30 25 Backup Lamps, Electronic Cluster 31 10 Rear Air Suspension 32 15 RH Aero Headlamp, Trailer Park Lamps 33 15 Anti-Lock Brake (ABS) Relay, Anti-Lock Brake (ABS) Module, Daytime Running Lamp (DRL) Module 34 30 One Touch Relay, LH Window Motor 35 15 Anti-Theft Controller Module 36 30 A/C Mode Switch 37 20 Door Lock Actuators, Memory Door Lock Relay 38 15 Heated Mirrors (LH and RH) 39 30 Auxiliary Blower Motor, Ref. Valve Solenoid 40 30 Window Motor (RH) 41 5 Autolamp Relay Coils, Autolamp Sensor 42 — — 43 — — 44 — —

the fuse box you are looking for is under the dash on the passenger side, you will need to remove the plstic kick plate then look up and a little to the right,you might have to remove three screws located along the rear edge of the panel, when you have the cover off in the upper left hand corner of the fuse box you are looking for a fuse that is marked [ SBM ] this fuse is for you interior lights, there should be extra fuses, in the second row second from the bottom and the third row second rfom the top, you'll know their spares if they pull out really easy and have no metal connectors inside the slots you just pulled them out of.