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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 82 (Lighting Systems) >> Diagnostic Information and Procedures >> Daytime Running Lamps (DRL) Inoperative (Z88)

Daytime Running Lamps (DRL) Inoperative (Z88)

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Daytime Running Lamps (DRL) Inoperative (Z88)

Step Action Yes No
Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics 
Connector End View Reference: Master Electrical Component List
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Carefully supply sufficient light to the ambient light sensor.
  2. Place the headlamps in the AUTO position.
  3. Start the engine.
Do the low beam headlamp bulbs illuminate?		 Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3 With a scan tool, observe the DRL Relay Command parameter in the body control module (BCM) data list.
Does the scan tool display On?		 Go to Step 4  Go to Step 7 
4 Test the DRL supply voltage circuit for an open, high resistance, or short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 9  Go to Step 5 
5 Inspect for poor connections at the harness connector of the underhood fuse block. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 9  Go to Step 6 
6 Replace the underhood fuse block. Refer to Underhood Electrical Center or Junction Block Replacement .
Did you complete the repair?		 Go to Step 9  -
7 Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 9  Go to Step 8 
8 Replace the BCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 Go to Step 9  -
9 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 3 
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