U1191

U1191-LOST COMMUNICATION WITH UPPER SWITCH BANK





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

- When Monitored:
With the ignition on.

- Set Condition:
The Cluster does not receive information from the Upper Switch Bank.





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 2

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

2. MEASURE THE VOLTAGE OF THE (D506) LIN BUS CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the Upper Switch Bank harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (D506) LIN BUS circuit.

Is the voltage above 5 volts?

Yes

- Go To 4

No

- Go To 3

3. (D506) LIN BUS CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the Cluster C1 harness connector.
3. Measure the resistance of the (D506) LIN BUS circuit.

Is the resistance below 10K Ohms?

Yes

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

No

- Repair the open in the (D506) LIN BUS circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. (A909) FUSED B(+) CIRCUIT OPEN




1. Turn the ignition on.
2. Using a 12-volt test light connected to ground, check the (A909) Fused B(+) circuit at the Upper Switch Bank harness connector.

Does the test light illuminate brightly?

Yes

- Go To 5

No

- Repair the (A909) Fused B(+) circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

5. (Z912) GROUND CIRCUIT OPEN




1. Turn the ignition off.
2. Using a 12-volt test light connected to 12-volts, check the (Z912) Ground circuit at the Upper Switch Bank harness connector.

Does the test light illuminate brightly?

Yes

- Replace the Upper Switch Bank. Instrument Cluster Switch Pod - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Repair the (Z912) Ground circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.