B161E

B161E-READING LAMP CONTROL CIRCUIT





For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
With the ignition on.

- Set Condition:
When the Cluster detects an open or a short to ground driver circuit.





1. CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, read DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 4

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

2. CHECK THE VOLTAGE OF THE (M27) READING/RAIL LAMPS DRIVER CIRCUIT




1. Turn the ignition off.
2. Disconnect the Electronic Overhead Module C1 harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (M27) Reading/Rail Lamps Driver circuit.

Is the voltage above 10.0 volts?

Yes

- Go To 3

No

- Go To 4

3. CHECK THE (Z903) GROUND CIRCUIT




1. Measure the resistance between ground and the (Z903) Ground circuit.

Is the resistance below 10K Ohms?

Yes

- Replace the Electronic Overhead Module.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Repair the open in the (Z903) Ground Circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. CHECK THE (M27) READING/RAIL LAMPS DRIVER CIRCUIT FOR A SHORT TO GROUND




1. Disconnect the Cluster C2 harness connector.
2. Measure the resistance between ground and the (M27) Reading/Rail Lamps Driver circuit.

Is the resistance below 10K Ohms?

Yes

- Repair the short to ground in the (M27) Reading/Rail Lamps Driver circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 5

5. CHECK THE (M27) READING/RAIL LAMPS DRIVER CIRCUIT FOR AN OPEN




1. Measure the resistance of the (M27) Reading/Rail Lamps Driver circuit.

Is the resistance above 5.0 Ohms?

Yes

- Repair the open in the (M27) Reading/Rail Lamps Driver circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Cluster.
- Perform the BODY VERIFICATION TEST. Body Verification Test.