U1149

U1149-LOST COMMUNICATION WITH MULTI-FUNCTION SWITCH / U0212-LOST COMMUNICATION WITH SCM





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

- When Monitored:
With the ignition on.

- Set Condition:
The Cluster does not receive any LIN Bus messages from the SCM.





1. CHECK FOR AN ACTIVE DTC

NOTE: Before proceeding with this diagnostic process, verify the proper connection of the SCM C1 harness connector. A loose connection at this connector will cause this DTC to set.

1. Turn the ignition off.
2. Gently pull the SCM C1 connector harness to verify the locking tab is fully engaged. If the connector locking tab is not fully engaged, push to seat the connector locking tab.
3. Turn the ignition on.
4. Wait 30 seconds.
5. With the scan tool, read DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 2

No

- The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
- Perform the BODY VERIFICATION TEST. Body Verification Test

2. (D506) LIN BUS CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the Steering Column Module C1 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 3

No

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

3. (F202) FUSED IGNITION SWITCH OUTPUT (RUN/START) CIRCUIT OPEN




1. Measure the voltage of the (F202) Fused Ignition Switch Output (RUN/START) circuit.

Is the voltage above 10 volts?

Yes

- Go To 4

No

- Repair the (F202) Fused Ignition Switch Output (RUN/START) circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test

4. (A411) FUSED B+ (I.O.D.) CIRCUIT OPEN




1. Measure the voltage of the (A411) Fused B+ (I.O.D.) circuit.

Is the voltage above 10 volts?

Yes

- Go To 5

No

- Repair the (A411) Fused B+ (I.O.D.) circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test

5. (Z936/Z937) GROUND CIRCUIT OPEN




1. Measure the resistance between ground and the (Z936-MTX)/(Z937-ATX) Ground circuit.

Is the resistance below 10K ohms?

Yes

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

No

- Repair the (Z936-MTX)/(Z937-ATX) ground circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test