Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics Connector End View Reference: Lighting Systems Connector End Views , Steering Wheel and Column Connector End Views in Steering Wheel and Column, or Computer/Integrating Systems Connector End Views in Computer/Integrating Systems | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Do either the low beam headlamps or the high beam headlamps illuminate? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
3 | Do the headlamps change from low beams to high beams when the headlamp dimmer switch is toggled between the LOW BEAM and the HIGH BEAM position? | Go to Step 18 | Go to Step 4 |
4 | With a scan tool, observe the Head Lamp Switch parameter in the dash integration module (DIM) Inputs data list. Does the scan tool indicate that the Head Lamp Switch parameter is OFF? | Go to Step 5 | Go to Step 12 |
5 | With a scan tool, observe the Low/High Beam Output parameter. Does the scan tool indicate that the Low/High Beam Output parameter is OFF? | Go to Step 6 | Go to Step 22 |
6 | Are the high beam headlamps ON? | Go to Step 7 | Go to Step 8 |
7 | With the scan tool, observe the Flash to Pass Switch input parameter. Does the scan tool indicate that the Flash to Pass Switch parameter is OFF? | Go to Step 10 | Go to Step 13 |
8 |
Did the low beam headlamps turn OFF? | Go to Step 9 | Go to Step 24 |
9 |
Did the test lamp illuminate? | Go to Step 14 | Go to Step 20 |
10 |
Did the high beam headlamps turn OFF? | Go to Step 11 | Go to Step 25 |
11 |
Did the test lamp illuminate? | Go to Step 15 | Go to Step 21 |
12 |
Does the scan tool indicate that the Head Lamp Switch parameter is OFF? | Go to Step 19 | Go to Step 17 |
13 |
Does the scan tool indicate that the Flash to Pass Switch is OFF? | Go to Step 23 | Go to Step 16 |
14 | Test for a short to ground in the headlamp low beam relay control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 31 | Go to Step 22 |
15 | Test for a short to ground in the headlamp high beam relay control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 31 | Go to Step 22 |
16 | Test for a short to ground in the flash to pass switch signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 31 | Go to Step 22 |
17 | Test for a short to ground in the headlamps on signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 31 | Go to Step 22 |
18 | Test for a short to ground in the headlamp control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 31 | Go to Step 22 |
19 | Inspect for poor connections at the harness connector of the headlamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 31 | Go to Step 26 |
20 | Inspect for poor connections at the HDLP LO BM relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 31 | Go to Step 27 |
21 | Inspect for poor connections at the HDLP HI BM relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 31 | Go to Step 28 |
22 | Inspect for poor connections at the harness connector of the DIM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 31 | Go to Step 29 |
23 | Inspect for poor connections at the harness connector of the headlamp dimmer switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 31 | Go to Step 30 |
24 | Repair the short to voltage in the appropriate headlamp low beam supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 31 | -- |
25 | Repair the short to voltage in the appropriate headlamp high beam supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 31 | -- |
26 | Replace the headlamp switch. Refer to Headlamp Switch Replacement . Did you complete the replacement? | Go to Step 31 | -- |
27 | Replace the HDLP LO BM relay. Refer to Relay Replacement in Wiring Systems. Did you complete the replacement? | Go to Step 31 | -- |
28 | Replace the HDLP HI BM relay. Refer to Relay Replacement in Wiring Systems. Did you complete the replacement? | Go to Step 31 | -- |
29 | Replace the DIM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 31 | -- |
30 | Replace the headlamp dimmer switch. Refer to Turn Signal Multifunction Switch Replacement in Steering Wheel and Column. Did you complete the replacement? | Go to Step 31 | -- |
31 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
