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 | |
2 |
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 |
Daytime Running Lamps (DRL) Inoperative X88 and Z75
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics Connector End View Reference: Lighting Systems Connector End Views or Data Communication Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Does the system operate normally? | Go to Step 3 | |
3 | Is only one daytime running lamp (DRL) inoperative? | Go to Step 4 | Go to Step 5 |
4 | Test the supply and ground circuits of the affected lamp for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 16 |
5 |
Does the scan tool display RELEASED? | Go to Step 7 | Go to Step 6 |
6 | Test the signal circuit of the park brake switch for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 11 |
7 |
Do the DRL illuminate? | Go to Step 8 | Go to Step 12 |
8 |
Is a ground signal present? | Go to Step 15 | Go to Step 9 |
9 | Test the DRL relay control circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 10 |
10 | 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 17 | Go to Step 13 |
11 | Inspect for poor connections at the harness connector of the park brake switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 14 |
12 | Repair the DRL supply voltage circuit. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 17 | -- |
13 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 17 | -- |
14 | Replace the park brake switch. Refer to Parking Brake Indicator Switch Replacement . Did you complete the replacement? | Go to Step 17 | -- |
15 | Replace the underhood fuse block. Refer to Underhood Electrical Center or Junction Block Replacement . Did you complete the replacement? | Go to Step 17 | -- |
16 | Replace the inoperative DRL. 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 |
