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 the low beam headlamps illuminate? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 | Are both low beam headlamps inoperative? | Go to Step 6 | Go to Step 4 |
4 |
Does the test lamp illuminate? | Go to Step 5 | Go to Step 22 |
5 | Connect a test lamp between the supply voltage circuit of the inoperative low beam headlamp and the ground circuit of the inoperative low beam headlamp. Does the test lamp illuminate? | Go to Step 20 | Go to Step 24 |
6 |
Does the scan tool indicate that the Head Lamp Switch parameter is ON? | Go to Step 7 | Go to Step 13 |
7 |
Do hear a click when you command the HDLP LO BM relay ON and OFF? | Go to Step 11 | Go to Step 8 |
8 |
Connect a test lamp between the controlled positive voltage circuit of the HDLP LO BM relay coil and a good ground. Does the test lamp illuminate? | Go to Step 9 | Go to Step 25 |
9 |
Does the test lamp turn ON and OFF with each command? | Go to Step 18 | Go to Step 10 |
10 |
Does the test lamp turn ON and OFF with each command? | Go to Step 19 | Go to Step 15 |
11 |
Does the test lamp illuminate? | Go to Step 12 | Go to Step 23 |
12 | Connect a 10-amp fused jumper between the battery positive voltage circuit of the HDLP LO BM relay switch and the supply voltage circuit of the low beam headlamps. Do the low beam headlamps illuminate? | Go to Step 18 | Go to Step 24 |
13 | Test for an open or high resistance in the headlamps on signal circuit of the headlamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 31 | Go to Step 14 |
14 | Test for an open or high resistance in the ground circuit of the headlamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 31 | Go to Step 17 |
15 | Test for an open or short to battery positive voltage in the control circuit of the HDLP LO BM relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 31 | Go to Step 16 |
16 | Test for an open or high resistance 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 21 |
17 | Inspect for poor connections at 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 |
18 | 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 28 |
19 | Inspect for poor connections at 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 27 |
20 | Inspect for poor connections at the inoperative low beam headlamp. 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 |
21 | Inspect for poor connections at 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 30 |
22 | Repair an open or short to ground in the supply voltage circuit of the low beam headlamps. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 31 | -- |
23 | Repair an open or high resistance in the battery positive voltage circuit of the HDLP LO BM relay switch. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 31 | -- |
24 | Repair an open or high resistance in the ground circuit of the low beam headlamps. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 31 | -- |
25 | Repair an open or high resistance in the controlled positive voltage circuit of the HDLP LO BM relay coil. 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 headlamp dimmer switch. Refer to Turn Signal Multifunction Switch Replacement in Steering Wheel and Column. Did you complete the replacement? | Go to Step 31 | -- |
28 | Replace the HDLP LO BM relay. Refer to Relay Replacement in Wiring Systems. Did you complete the replacement? | Go to Step 31 | -- |
29 | Replace the inoperative low beam headlamp. Refer to Headlamp Bulb Replacement . Did you complete the replacement? | Go to Step 31 | -- |
30 | 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 | -- |
31 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
