For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Headlamp Diagnostic System Check performed? | -- | Go to Step 2 | Go to Headlight System Check
2 | Inspect the HEADLAMP circuit breaker. Is the circuit breaker open? | -- | Go to Step 3 | Go to Step 4
3 | Repair a short to ground in CKT 2340. Is the repair complete? | -- | Go to Headlight System Check | --
4 |

1. Turn the headlamp switch to the HEAD position.
2. Use a test lamp in order to backprobe between C201 terminal E13 and ground.

Did the test lamp light?

--

Go to Step 8

Go to Step 5

5 | Use a test lamp in order to backprobe between the headlamp dimmer switch harness connector terminal L and ground. Did the test lamp light? | -- | Go to Step 7 | Go to Step 6
6 | Use a test lamp in order to backprobe between the headlamp and instrument panel dimmer switch harness connector terminal N and ground. Did the test lamp light? | -- | Go to Step 9 | Go to Step 10
7 | Repair the faulty connection and/or open in CKT 10 between C201 terminal E13 and the headlamp dimmer switch connector terminal L. Is the repair complete? | -- | Go to Headlight System Check | --
8 |

1. Use a test lamp in order to backprobe between C201 terminal E12 and ground.
2. Activate the dimmer switch.

Did the test lamp light?

--

Go to Step 11

Go to Step 9

9 | Replace the headlamp dimmer switch. Refer to Headlamp Switch Replacement . Is the repair complete? | -- | Go to Headlight System Check | --
10 | Repair the faulty connection or open in CKT 2340. Is the repair complete? | -- | Go to Headlight System Check | --
11 |

1. Use a test lamp in order to backprobe between C201 terminal E11 and ground.
2. Activate the dimmer switch.

Did the test lamp light?

--

Go to Step 12

Go to Step 9

12 | If the test lamp was lit in either Step 8 or Step 11, refer to Headlamps Inoperative - Low Beams or Headlamps Inoperative - High Beams . Was the test lamp lit in Step 8 or Step 11? | -- | Go to Headlamps Inoperative - Low Beams or Headlamps Inoperative - High Beams | --