B2101-IGNITION RUN/START INPUT CIRCUIT LOW

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

When Monitored:
With the ignition switch on.
Set Condition:
The Totally Integrated Power Module (TIPM) receives a CAN Bus message that indicates the ignition status equals RUN, while the hardwired Run/Start input indicates the ignition switch is in the OFF/LOCK position.

Possible Causes
(F20) IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT OPEN
(A106) FUSED B+ OPEN OR SHORTED TO GROUND
IGNITION SWITCH
TOTALLY INTEGRATED POWER MODULE (TIPM)

1. CHECK FOR ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)

NOTE: Check all related fuses before proceeding with the diagnostic procedure.

1.	Turn the ignition on.

2.	Using the scan tool, read active DTCs.

Does the scan tool display this DTC as active?

Yes

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. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

2. CHECK THE (F20) IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT FOR AN OPEN

1.	Turn the ignition off.

2.	Disconnect the TIPM C7 harness connector.

3.	Turn the ignition on.

4.	Using a 12-volt test light connected to ground, check the (F20) Ignition Switch output (Run-Start) circuit at the TIPM C7 harness connector.

Does the test light illuminate brightly?

Yes

Replace the Totally Integrated Power Module (TIPM) in accordance with the Service Information.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

3. CHECK THE (A106) FUSED B+ CIRCUIT FOR AN OPEN OR SHORT TO GROUND

1.	Turn the ignition off.

2.	Disconnect the Ignition Switch harness connector.

3.	Using a 12-volt test light connected to ground, check the (A106) Fused B+ circuit at the Ignition Switch harness connector.

Does the test light illuminate brightly?

Yes

Using the wiring diagram as a guide, repair the (A106) Fused B+ circuit for an open or short to ground.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

4. IGNITION SWITCH

1.	Reconnect the Ignition Switch harness connector.

2.	Turn the ignition on.

3.	Using a 12-volt test light connected to ground, backprobe the (F20) Ignition Switch output (Run-Start) circuit at the Ignition Switch harness connector.

Does the test light illuminate brightly?

Yes

Repair the (F20) Ignition Switch output (Run-Start) circuit for an open.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

Replace the Ignition 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).