U1149-LOST COMMUNICATION WITH MULTIFUNCTION SWITCH

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 Left Multifunction Switch.

Possible Causes
(D506) LIN BUS CIRCUIT OPEN
(F943) FUSED RUN/START RELAY OUTPUT CIRCUIT OPEN
(A412) FUSED B(+) (I.O.D.) CIRCUIT OPEN
(Z910) GROUND CIRCUIT OPEN
LEFT MULTIFUNCTION SWITCH
CLUSTER

1. CHECK FOR AN ACTIVE DTC

NOTE: Before proceeding with this diagnostic procedure, verify the Left and Right Multifunction Switch and Clockspring harness connectors are properly seated and verify proper pin terminal tension. A loose connection at any of these connectors may cause this DTC to set.

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

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. (D506) LIN BUS CIRCUIT

1.	Turn the ignition off.

2.	Disconnect the Left Multifunction Switch C1 harness connector.

3.	Turn the ignition on.

4.	Measure the voltage of the (D506) LIN BUS circuit.

Is the voltage above 5.0 volts?

Yes

Go To 3

Repair the (D506) LIN BUS circuit for an open.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

3. (F943) FUSED RUN/START RELAY OUTPUT CIRCUIT OPEN

1.	Turn the ignition on.

2.	Measure the voltage of the (F943) Fused RUN/START Relay Output circuit at the Left Multifunction Switch C1 harness connector.

Is the voltage above 10 volts?

Yes

Go To 4

Repair the open in the (F943) Fused RUN/START Relay Output circuit.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

4. (A412) FUSED B(+) (I.O.D.) CIRCUIT OPEN

1.	Turn the ignition on.

2.	Measure the voltage of the (A412) Fused B+ (I.O.D.) circuit at the Left Multifunction Switch C1 harness connector.

Is the voltage above 10 volts?

Yes

Go To 5

Repair the open in the (A412) Fused B+ (I.O.D.) circuit.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

5. (Z910) GROUND CIRCUIT OPEN

1.	Turn the ignition off.

2.	Measure the resistance between ground and the (Z910) Ground circuit at the Left Multifunction Switch C1 harness connector.

Is the resistance below 5.0 Ohms?

Yes

Replace the Left Multifunction Switch in accordance with the service information.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

Repair the open in the (Z910) ground circuit.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

U1149-LOST COMMUNICATION WITH MULTIFUNCTION SWITCH

Possible Causes