Schematic Reference: Interior Lights Dimming Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

Did you perform the Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

1. Turn the ignition to the ON position.
2. Turn the headlamp switch to the PARK position.
3. Turn the dimmer/HUD switch to a high position.

Are all the I/P lamps ON?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

Are all of the I/P lamps inoperative?

Go to Step 4

Go to Step 11

1. Remove the dimmer/HUD switch.
2. Using a test lamp connected to battery positive voltage, probe the dimmer/HUD switch ground circuit.

Does the test lamp illuminate?

Go to Step 6

Go to Step 22

1. Reconnect the dimmer/HUD switch.
2. Disconnect the I/P cluster C3.
3. Install a jumper between the dimmer/HUD switch ground circuit and ground.
4. Using a test lamp connected to battery positive voltage, probe the I/P dimmer select switch circuit.
5. Press the dim set select switch.

Does the test lamp illuminate?

Go to Step 8

Go to Step 7

Test for a short to battery positive voltage, an open or a poor connection in the I/P dimmer select switch circuit of the dimmer/HUD switch. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 43

Go to Step 37

1. Using a test lamp connected to battery positive voltage, probe the I/P lamps dimmer switch down signal circuit.
2. Press the dim set down switch.

Does the test lamp illuminate?

Go to Step 10

Go to Step 9

Test for a short to battery positive voltage, an open or a poor connection in the I/P lamps dimmer switch down signal circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 43

Go to Step 26

1. Using a test lamp connected to battery positive voltage, probe the I/P lamps dimmer switch up signal circuit.
2. Press the dim up switch.

Does the test lamp illuminate?

Go to Step 35

Go to Step 11

Test for a short to battery positive voltage, an open or a poor connection in the I/P lamps dimmer switch up signal circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 43

Go to Step 37

Is the steering wheel backlighting inoperative?

Go to Step 24

Go to Step 12

Is the ignition switch, trunk release and fuel door release switch backlighting inoperative?

Go to Step 13

Go to Step 14

Test for a poor connection, an open or a short to ground in the I/P lamps dimming control circuit of the I/P cluster. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 43

Go to Step 35

Is either of the door switched backlighting inoperative?

Go to Step 15

Go to Step 16

Test for a poor connection, an open or a short to ground in the LCD backlighting lamp control circuit of the inoperative door module. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 43

Go to Step 39

Is the radio backlighting inoperative?

Go to Step 38

Go to Step 17

Is the driver information switch inoperative?

Go to Step 28

Go to Step 18

Are the hazard switch, automatic transmission shift lever and traction control switches backlighting inoperative?

Go to Step 19

Go to Step 20

Test for a poor connection, an open or a short to ground in the I/P lamps supply voltage circuit of the HVAC control assembly. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 43

Go to Step 40

Is the dimmer/HUD switch backlighting inoperative?

Go to Step 21

Go to Step 33

1. Disconnect the dimmer/HUD switch.
2. Using a test lamp connected to ground, probe the I/P lamps supply voltage circuit.

Does the test lamp illuminate?

Go to Step 41

Go to Step 22

Test for a poor connection, an open or a short to ground in the I/P lamps supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 43

Go to Step 37

Test for a poor connection, an open or a short to battery positive in the ground circuit of the dimmer/HUD switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 43

Go to Step 35

1. Disconnect the steering wheel control switch assembly.
2. Using a test lamp connected to ground, probe the I/P lamp supply voltage of the steering wheel control switch.

Does the test lamp illuminate?

Go to Step 26

Go to Step 25

Test for a poor connection, an open or a short to ground in the I/P lamp supply voltage circuit of the steering wheel control switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 43

Go to Step 35

Using a test lamp connected to battery positive, probe the ground circuit of the steering wheel control switch.

Does the test lamp illuminate?

Go to Step 42

Go to Step 27

Repair a poor connection or an open in the ground circuit of the steering wheel control switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 43

--

1. Disconnect the driver information center (DIC).
2. Using a test lamp connected to ground, probe the I/P lamps supply voltage circuit of the DIC.

Does the test lamp illuminate?

Go to Step 30

Go to Step 29

Test for a poor connection, an open or a short to ground in the I/P lamps supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 43

Go to Step 35

Using a test lamp connected to battery positive voltage, probe the ground circuit of the DIC.

Does the test lamp illuminate?

Go to Step 41

Go to Step 31

Test for a poor connection, an open or a short to battery positive voltage in the ground circuit of the DIC. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 43

Go to Step 35

1. Disconnect the folding top switch.
2. Using a test lamp connected to battery positive, probe the I/P lamps dimming control circuit.

Does the test lamp illuminate?

Go to Step 34

Go to Step 33

Test for a poor connection, an open or a short to battery positive voltage in the I/P lamps dimming control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 43

Go to Step 40

Test for a poor connection, an open or a short to ground in the Tilt/Tele SW/MEM Seat Mod fuse voltage supply circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 43

Go to Step 36

Replace the I/P cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gages and Console.

Did you complete the replacement?

Go to Step 43

--

Important: Perform the setup procedure for the BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Computer/Integrating Systems.

Replace the BCM. Refer to Body Control Module Replacement in Computer/Integrating Systems.

Did you complete the replacement?

Go to Step 43

--

Replace the dimmer/HUD switch. Refer to Head Up Display Switch Replacement in Instrument Panel, Gages and Console.

Did you complete the replacement?

Go to Step 43

--

Replace the radio. Refer to Radio Replacement in Entertainment.

Did you complete the replacement?

Go to Step 43

--

Replace the inoperative door module. Refer to Door Control Module Replacement in Doors.

Did you complete the replacement?

Go to Step 43

--

Replace the HVAC control assembly. Refer to HVAC Control Module Replacement in HVAC Systems-Automatic.

Did you complete the replacement?

Go to Step 43

--

Replace the driver information center (DIC). Refer to Driver Information Display Switch Replacement in Instrument Panel, Gages and Console.

Did you complete the replacement?

Go to Step 43

--

Replace the steering wheel control switch. Refer to Steering Wheel Control Switch Assembly Replacement in Steering Wheel and Column.

Did you complete the replacement?

Go to Step 43

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3