B2100

B2100-IGNITION RUN/START INPUT CIRCUIT PERFORMANCE

B2100 - Ignition Run/Start Input Circuit Performance:

WHEN MONITORED
With the ignition on.

SET MONITORED
The Front Control Module will set this DTC if the CAN bus message and the hardwired ignition switch circuit do not match the position of the ignition switch.

POSSIBLE CAUSES
- Junction block fuse #18
- (F202) Fused ignition switch output circuit open
- (F202) Fused ignition switch output circuit shorted to ground
- Front control module

Diagnostic Test

1. CHECK FOR ACTIVE DTC
With the scan tool, read the active DTC's.
Cycle the ignition switch from off to on, leaving the ignition on for a minimum of 90 seconds.
With the scan tool, read the active DTC's.

Q: Does the scan tool display this DTC as active?

YES: Go To 2
NO: If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.

2. INSPECT JUNCTION BLOCK FUSE #18




Turn the ignition off.
Remove and inspect Junction Block Fuse #18.

Q: Is the fuse open?

YES: Replace fuse and retest. If fuse continues to fail inspect the wiring between the Junction Block and the Front Control Module for a short to ground. Perform BODY VERIFICATION TEST - VER 1.
NO: Go To 3

3. (F941) IGNITION SWITCH OUTPUT CIRCUIT OPEN




Turn the ignition on.
Measure the voltage of the (F941) Ignition Switch Output circuit at the fuse input terminal.

Q: Is the voltage above 10.0 volts?

YES: Go To 4
NO: Repair the (F941) Ignition Switch Output circuit for an open. Perform BODY VERIFICATION TEST - VER 1.

4. (F202) FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN




Turn the ignition off.
Install Fuse #18 in the Junction Block.
Remove the FCM from the Power Distribution Module.
Turn the ignition on.
Measure the voltage of the (F202) Fused Ignition Switch output circuit.

Q: Is the voltage above 10.0 volts?

YES:Inspect the wiring and connectors for damage or shorted circuits. If Ok, replace and program the Front Control Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1.
NO: Repair the (F202) Fused Ignition Switch Output circuit for an open. Perform BODY VERIFICATION TEST - VER 1.