2007 Commander XK Factory Service Manual 8 - ELECTRICAL

B1241-C/T SWITCH STUCK

For a complete wiring diagram Refer to Section 8W.

When Monitored:
With the ignition on.
Set Condition:
The Instrument Cluster detects the C/T Switch active for greater than 20 seconds.

Possible Causes

(G105) C/T SWITCH INPUT CIRCUIT SHORT TO GROUND

UPPER SWITCH BANK

INSTRUMENT CLUSTER

Diagnostic Test

1. CHECK FOR ACTIVE DTC

Press and release the switch three times.
Turn the ignition on.
With the scan tool, record and erase Instrument Cluster DTCs.
Turn the ignition off.
Turn the ignition on.
Wait 30 seconds.
With the scan tool, read Instrument Cluster DTCs.

Is DTC: B1241-C/T SWITCH STUCK 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 BODY VERIFICATION TEST VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

2. CHECK OPERATION OF THE UPPER SWITCH BANK

Turn the ignition off.
Disconnect the Upper Switch Bank Harness Connector.
Turn the ignition on.
Wait 30 seconds.
With the scan tool, read Instrument Cluster DTCs.

Does the scan tool display: B1241-C/T SWITCH STUCK?

Yes

Go To 3

No

Replace the Upper Switch Bank in accordance with the Service Information.
Perform BODY VERIFICATION TEST VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

3. CHECK THE (G105) C/T SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND

Turn the ignition off.
Disconnect the Instrument Cluster C1 harness connector.
Measure the resistance of the (G105) C/T Switch Input circuit for a short to ground.

Is the resistance below 10K ohms?

Yes

Repair the (G105) C/T Switch Input circuit for a short to ground.

Perform BODY VERIFICATION TEST VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

No

Replace the Instrument Cluster in accordance with the Service Information.
Perform BODY VERIFICATION TEST VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)