Headlamps Inoperative - Low Beams Standard
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 | |
2 | Verify that the low beam headlamps are inoperative. Do the headlamps operate normally? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the test lamp illuminate? | Go to Step 5 | Go to Step 4 |
4 | Repair the open or high resistance in the headlamp dimmer switch low beam signal circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 6 | -- |
5 | Replace the multifunction switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering Wheel and Column - Standard or Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering Wheel and Column - Tilt. Did you complete the repair? | Go to Step 6 | -- |
6 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
Headlamps Inoperative - Low Beams Envoy and Diamond Edition w/HID
Step | Action | Yes | No | ||||
|---|---|---|---|---|---|---|---|
|
Caution: The high intensity discharge system produces high voltage and current.
To reduce the risk of severe shocks and burns:
Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics | |||||||
1 | Did you perform the Lighting Systems Diagnostic System Check? | Go to Step 2 | |||||
2 | Verify that the low beam headlamps are inoperative. Do the headlamps operate normally? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 | ||||
3 | Is only one low beam headlamp inoperative? | Go to Step 5 | Go to Step 4 | ||||
4 | Do the high beam headlamps remain on when the multifunction headlamp dimmer switch is placed in the low beam position? | Go to Step 12 | Go to Step 8 | ||||
5 |
Does the test lamp illuminate? | Go to Step 6 | Go to Step 13 | ||||
6 | Connect a test lamp between the headlamp ballast forward lamps harness connector terminal A and terminal B of the same connector to the inoperative lamp. Refer to Circuit Testing in Wiring Systems. Does the test lamp illuminate? | Go to Step 7 | Go to Step 14 | ||||
7 |
Important: Make sure that the headlamp ballast connector retaining clip is fully installed on the Philips system otherwise the ballast will not operate. Install a known good ballast. Refer to High Intensity Discharge Headlamp Ballast Replacement . Does the lamp operate properly? | Go to Step 22 | Go to Step 18 | ||||
8 | Test the battery positve voltage circuit to the headlamp switch for an open, high resistance or short to ground. Refer to Circuit Testing in Wiring Systems. Was a problem found? | Go to Step 15 | Go to Step 9 | ||||
9 | Disconnect the headlamp switch and test for continuity between the battery positve voltage circuit input terminal and the headlamp switch headlamps on signal output terminal at the headlamp switch with the headlamp switch in the HEAD position. Refer to Circuit Testing in Wiring Systems. Is continuity present? | Go to Step 10 | Go to Step 19 | ||||
10 | With the headlamp switch still disconnected, test for continuity between the battery positve voltage circuit input terminal and the headlamp switch ground terminal at the headlamp switch with the headlamp switch in the HEAD position. Refer to Circuit Testing in Wiring Systems. Is continuity present? | Go to Step 19 | Go to Step 11 | ||||
11 | Test the headlamp switch headlamps on signal circuit for an open or high resistance. Refer to Circuit Testing in Wiring Systems. Was a problem found? | Go to Step 16 | Go to Step 20 | ||||
12 | Test the high beam relay control circuit for a short to ground. Refer to Circuit Testing in Wiring Systems. Was a problem found? | Go to Step 17 | Go to Step 21 | ||||
13 | Repair the open, high resistance or short to ground in inoperative headlamp ballast supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 22 | -- | ||||
14 | Repair the open or high resistance in inoperative headlamp ballast ground circuit. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 22 | -- | ||||
15 | Repair the open, high resistance or short to ground in the headlamp switch battery positive voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 22 | -- | ||||
16 | Repair the open or high resistance in the headlamp switch headlamps on signal circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 22 | -- | ||||
17 | Repair the short to ground in the high beam relay control circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 22 | -- | ||||
18 | Replace the arc tube assembly for the inoperative headlamp. Refer to High Intensity Discharge Headlamp Starter/Arc Tube Replacement . Did you complete the repair? | Go to Step 22 | -- | ||||
19 | Replace the headlamp switch. Refer to Headlamp Switch Replacement . Did you complete the repair? | Go to Step 22 | -- | ||||
20 | Replace the low beam relay. Did you complete the repair? | Go to Step 22 | -- | ||||
21 | Replace the multifunction headlamp dimmer switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering Wheel and Column - Tilt. Did you complete the repair? | Go to Step 22 | -- | ||||
22 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 | ||||
