Symptom Related Diagnostic Procedures

LOST COMMUNICATION WITH MULTIFUNCTION SWITCH

Lost Communication With Multifunction Switch:

WHEN MONITORED
With the ignition on.

SET CONDITION
The Cluster receives no messages from the Multifunction Switch.

POSSIBLE CAUSES
- (D506) LIN BUS circuit open
- (F20) Fused ignition switch output (run) circuit open
- (A411) Fused B+ (I.O.D.) circuit open
- (Z906) Ground circuit open
- SCM

Diagnostic Test

1. CHECK FOR AN ACTIVE DTC

Turn the ignition on.
With the scan tool, record and erase DTCs.
Wait 30 seconds.
With the scan tool, read DTCs.

Q: Does the scan tool display: LOST COMMUNICATION WITH MULTIFUNCTION SWITCH?

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 chaffed, 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 - VER 1. Body Verification Test




2. (D506) LIN BUS CIRCUIT OPEN

Turn the ignition off.
Disconnect the Steering Column Module C1 harness connector.
Turn the ignition on.
Measure the voltage of the (D506) LIN BUS circuit.

Q: 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 - VER 1. Body Verification Test




3. (F20) FUSED IGNITION SWITCH OUTPUT (RUN) CIRCUIT OPEN

Measure the voltage of the (F20) Fused Ignition Switch Output (RUN) circuit.

Q: Is the voltage above 10 volts?

YES: Go To 4
NO: Repair the (F20) Fused Ignition Switch Output (RUN) circuit for an open. Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test




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

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

Q: 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 - VER 1. Body Verification Test




5. (Z906) GROUND CIRCUIT OPEN

Measure the resistance between ground and the (Z906) Ground circuit.

Q: Is the resistance below 10K ohms?

YES: Replace the SCM. Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Repair the (Z906) ground circuit for an open. Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test