For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Exterior Lights System Check performed? | -- | Go to Step 2 | Go to Exterior Lights System Check
2 | Backprobe the light 1 relay with a test lamp from cavity 1 to ground. Does the test lamp light? | -- | Go to Step 3 | Go to Step 4
3 | Backprobe the light 1 relay with a test lamp from cavity 4 to ground. Does the test lamp light? | -- | Go to Step 6 | Go to Step 7
4 | Test for an open in the WHT wire between the relay box and the junction block. Was an open found? | -- | Go to Step 12 | Go to Step 5
5 | Replace junction block. Is the repair complete? | -- | Go to Exterior Lights System Check | --
6 |

1. Turn the light switch to the PARK position.
2. Backprobe the light 1 relay with a test lamp from cavity 2 to B+.

Does the test lamp light?

--

Go to Step 8

Go to Step 10

7 | Repair the open in the WHT wire between S256 and the relay box. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Exterior Lights System Check | --
8 | Test for an open in the RED/YEL wire between the relay box and S204. Was an open found? | -- | Go to Step 12 | Go to Step 9
9 | Replace the light 1 relay. Is the repair complete? | -- | Go to Exterior Lights System Check | --
10 | Test the following for opens:

• | The RED/GRN wire between the combination switch and the relay box

• | The BLK wire between the combination switch and the junction block

Was an open found?

--

Go to Step 12

Go to Step 11

11 | Replace the combination switch. Refer to Inflatable Restraint Steering Wheel Module Coil Replacement in Restraints. Is the repair complete? | -- | Go to Exterior Lights System Check | --
12 | Repair the open. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Exterior Lights System Check | --