B2100

B2100-IGNITION RUN/START INPUT CIRCUIT PERFORMANCE

B2100-Ignition Run/Start Input Circuit Performance:

WHEN MONITORED
Anytime the ignition input is compared against the CAN B Bus ignition status message.

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

POSSIBLE CAUSES
- Active ignition related FCM DTCs
- (A106) fused B+ circuit open
- (F20) fused ignition switch output circuit open
- (F202) fused ignition switch output circuit open
- Rear PDC fuse
- Ignition switch
- Front control module

DIAGNOSTIC TEST

1. CHECK FOR ACTIVE DTC

NOTE:
- If B2104 or B2105 are active, perform those tests first before proceeding.
- Check the rear PDC fuses. An open fuse can cause this DTC to set. If open refer to the wiring diagrams to help isolate a possible shorted circuit.

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. CHECK THE (F20) FUSED IGNITION SWITCH OUTPUT CIRCUIT FOR AN OPEN
Turn the ignition off.
Remove the fused ignition switch output fuse from the rear PDC.
Turn the ignition on.
Measure the voltage of the (F20) Fused Ignition Switch Output circuit (input side of fuse).

Q: Is the voltage above 10.0 volts?

YES: Go To 3
NO: Go To 4

3. (F202) FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN




Turn the ignition off.
Remove the FCM from the Power Distribution Module.

NOTE: Install the fuse in the rear PDC.

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. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Repair the (F202) Ignition Switch Output circuit for an open between the rear PDC and the front PDM. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

4. (A106) FUSED B+ CIRCUIT OPEN




Turn the ignition off.
Disconnect the Ignition Switch harness connector.
Measure the voltage of the (A106) Fused B+ circuit.

Q: Is the voltage above 10.0 volts?

YES: Repair the (F20) Fused Ignition Switch Output circuit for an open between the Ignition Switch and the rear PDC. If ok, replace the Ignition Switch. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Repair the (A106) Fused B+ circuit for an open. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test