SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1606 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESMEMORY/HEATED SEAT SWITCH BACKLIGHTING INOPERATIVE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Memory/Heated Seat Switch Backlighting Inoperative

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Memory/Heated Seat Switch Backlighting Inoperative
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Memory/Heated Seat Switch Backlighting Inoperative

Step Action Yes No
Schematic Reference:  Interior Lights Dimming Schematics  
1 Did you perform the Lighting Systems Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Lighting Systems 
2 Verify that the memory/heated switch backlighting is inoperative.
Does the memory/heated switch backlighting operate normally?		 Go to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS in Wiring Systems Go to Step 3 
3 Are any other dimmable interior backlighting lamps inoperative? Go to Interior Backlighting Inoperative  Go to Step 4 
4
  • Place the headlamp switch in the PARK position.
  • Adjust the IP dimmer switch to the full intensity position.
  • Test for an open, high resistance, or short to voltage in the memory/heated seat switch illumination control circuit. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Did you find and correct a condition?		 Go to Step 10  Go to Step 5 
5 Use a test lamp connected to B+ to backprobe the memory/heated seat switch illumination control circuit terminal at the driver door module (DDM) connector.
Does the test lamp illuminate?		 Go to Step 7  Go to Step 6 
6 Inspect for poor connections at the harness connector of the DDM. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Did you find and correct the condition?		 Go to Step 10  Go to Step 8 
7 Inspect for poor connections at the harness connector of the memory/heated seat switch. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Did you find and correct the condition?		 Go to Step 10  Go to Step 9 
8
IMPORTANT: Perform the setup procedure for the driver door module (DDM).
Replace the DDM. Refer to SWITCH REPLACEMENT - DOOR LOCK AND SIDE WINDOW - DRIVER in Doors.Did you complete the replacement?		 Go to Step 10  -
9 Replace the memory/heated seat switch. Refer to MEMORY SEAT SWITCH REPLACEMENT in Seats.
Did you complete the replacement?		 Go to Step 10  -
10 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 3 
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.