LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1657 (Lighting Systems) >> Diagnostic Information and Procedures >> Headlamps Inoperative - Flash to Pass

Headlamps Inoperative - Flash to Pass

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.
Headlamps Inoperative - Flash to Pass

Step Action Yes No
Schematic Reference:  Headlights/Daytime Running Lights (DRL) 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 flash to pass (FTP) is inoperative.
Does the FTP operate normally?		 Go to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS in Wiring Systems Go to Step 3 
3 Do the high beam headlamps operate normally? Go to Symptoms - Lighting Systems  Go to Step 4 
4
  1. Turn the key to RUN with the engine OFF.
  2. Connect a fused jumper from ground to the headlamp switch flash to pass signal terminal of the headlamp dimmer switch connector.
Do the high beam headlamps illuminate?		 Go to Step 6  Go to Step 5 
5 Test the headlamp switch flash to pass signal circuit for an open or high resistance. Refer toCIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Did you find and correct a condition?		 Go to Step 10  Go to Step 7 
6 Inspect for poor connections at the harness connector of the headlamp dimmer 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 
7 Inspect for poor connections at the harness connector of the Body Control Module (BCM). 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 
8
IMPORTANT: Perform the setup procedure for the BCM.
Replace the body control module (BCM). Refer to BODY CONTROL MODULE REPLACEMENT in Body Control System.Did you complete the replacement?		 Go to Step 10  -
9 Replace the headlamp dimmer switch. Refer to MULTIFUNCTION, TURN SIGNAL & HAZARD SWITCH in Steering Wheel and Column.
Did you complete the repair?		 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 
scientia non olet · About LEMON Manuals