Test Description
The numbers below refer to the step numbers on the diagnostic table.
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Tests for the proper operation of the circuit in the high voltage range.
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Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Interior Lights Dimming Schematics | ||||
1 | Did you perform the Lighting Systems Diagnostic System Check? | -- | Go to Step 2 | |
2 | Operate the incandescent lamps. Are the incandescent lamps always on? | -- | Go to Step 3 | Go to Step 8 |
3 |
Does the scan tool indicate that the Interior Lamp Switch parameter is on? | -- | Go to Step 4 | Go to Step 5 |
4 |
Does the scan tool indicate that the Interior Lamp Switch parameter is on? | -- | Go to Step 14 | Go to Step 16 |
5 | Are the INC DIM-1 incandescent lamps always on? | -- | Go to Step 7 | Go to Step 6 |
6 |
Did the INC DIM-2 incandescent lamps turn off? | -- | Go to Step 17 | Go to Step 15 |
7 |
Did the INC DIM-1 incandescent lamps turn off? | -- | Go to Step 17 | Go to Step 18 |
8 |
Does the scan tool indicate that the Incandescent Dim Pot parameter is within the specified range? | 1-151 counts | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 9 |
Does the scan tool indicate that the Incandescent Dim Pot parameter is greater than the specified value? | 151 counts | Go to Step 10 | Go to Step 11 | |
Does the scan tool indicate that the Incandescent Dim Pot parameter is less than the specified value? | 1 count | Go to Step 16 | Go to Step 12 | |
11 | Test the instrument panel lamps dimmer switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 17 |
12 | Test the instrument panel lamps dimmer switch signal circuit for a short to voltage, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 13 |
13 | Test the low reference circuit of the IP dimmer switch for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 17 |
14 | Test the interior lamp switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 17 |
15 | Test the instrument panel lamp supply voltage-2 circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 18 |
16 | 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 21 | Go to Step 19 |
17 | Inspect for poor connections at the harness connector of the Instrument Cluster (IPC). 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 21 | Go to Step 20 |
18 | Repair a short to voltage in the instrument panel lamp supply voltage-1 circuit. Refer to Wiring Repairs in Wiring Systems. | -- | Go to Step 21 | -- |
19 | Replace the headlamp switch. Refer to Headlamp Switch Replacement . Did you complete the replacement? | -- | Go to Step 21 | -- |
20 | Replace the Instrument Cluster (IPC). Refer to Instrument Cluster Replacement in Instrument Panel, Gages and Console. Did you complete the replacement? | -- | Go to Step 21 | -- |
21 | Operate the system in order to verify the repair. Did you find and correct the condition? | -- | System OK | Go to Step 2 |
