B2108-IGNITION SWITCH SENSE INPUT CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W
- When Monitored:
Continuously.
- Set Condition:
The Steering Column Module (SCM) detects a short to ground on the Ignition Switch Sense circuit for more than 5 seconds.
| Possible Causes |
| INTERMITTENT IGNITION SWITCH SENSE INPUT CIRCUIT LOW DTC |
| (G20) IGNITION SWITCH SENSE CIRCUIT SHORT
TO GROUND |
| (Z907) GROUND CIRCUIT HIGH RESISTANCE |
| STEERING COLUMN MODULE (SCM) |
Diagnostic Test
1. DTC STATUS IS ACTIVETurn the ignition on.
With the scan tool, select View DTCs in the Steering Column Module.
Is the DTC status Active at this time?
Yes
- Go to 2
No
- Go to 5
2. (G20) IGNITION SWITCH SENSE CIRCUIT SHORT TO GROUND
Turn the ignition off.
Disconnect the Steering Column Module harness connector.
Measure the resistance between ground and the (G20) Ignition Switch Sense circuit in the Steering Column Module harness connector.
Is the resistance below 5.0 ohms?
Yes
- Repair the (G20) Ignition Switch Sense circuit for a short to ground.
No
- Go to 3
3. (Z907) GROUND CIRCUIT HIGH RESISTANCE
Using a 12–volt test light connected to 12–volts, check the (Z907) Ground circuit in the Steering Column Module harness connector.
NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
Does the test light illuminate brightly?
Yes
- Go To 4
No
- Repair the (Z907) Ground circuit for an open circuit or high resistance.
4. STEERING COLUMN MODULE (SCM)
View repair.
Repair
- Replace the Steering Column Module (SCM) in accordance with the Service Information.
5. INTERMITTENT IGNITION SWITCH SENSE INPUT CIRCUIT LOW DTC
The conditions necessary to set this DTC are not present at this time.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Were any problems found?
Yes
- Repair as necessary.
No
- Test complete.