1000 - 1999: 1210

1210 - CAB SYSTEM UNDERVOLTAGE





When Monitored and Set Condition

- When Monitored: Ignition on. The Controller Antilock Brake (CAB) monitors the Fused B(+) circuit voltage above 10 km/h (6 MPH) every 7 milliseconds for proper system voltage.
- Set Condition: If the voltage is below 9.5 volts, the Diagnostic Trouble Code (DTC) is set.





For a complete Antilock Brake System Circuit Diagram Brakes - ABS Electrical Diagnostics.

Diagnostic Test

1. WITH THE SCAN TOOL, READ DTCs
Turn the ignition on.
With the scan tool, erase DTCs.
Turn the ignition off.
Turn the ignition on.
Start the engine.
Drive the vehicle above 16 km/h (10 MPH) for at least 20 seconds.
Stop the vehicle.
With the scan tool, read DTCs.
Does the scan tool display a System Undervoltage DTC?

Yes

- Go to 2

No

- The condition that caused this DTC to set is currently not present. Inspect the related wiring harness for a possible intermittent condition.
- Refer to the ABS-INTERMITTENT CONDITION TEST. ABS Intermittent Condition Test

2. MEASURE THE BATTERY VOLTAGE




Start the engine.
Measure the battery voltage with the engine running.
Is the battery voltage below 10 volts?

Yes

- Refer to charging system testing and repair.
- Perform ABS VERIFICATION TEST. ABS Verification Test

No

- Go to 3

3. MEASURE THE VOLTAGE OF THE FUSED B(+) CIRCUIT




Turn the ignition off.
Disconnect the CAB harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Turn the ignition on.
Measure the voltage of the Fused B(+) circuit at the CAB harness connector.
Is the voltage above 10 volts?

Yes

- Go to 4

No

- Repair the Fused B(+) circuit for an open.
- Perform ABS VERIFICATION TEST. ABS Verification Test

4. MEASURE THE VOLTAGE OF THE FUSED B(+) CIRCUIT




With the ignition on.
Measure the voltage of the Fused B(+) circuit at the CAB harness connector.
Is the voltage above 10 volts?

Yes

- Replace the Controller Antilock Brake (CAB) Module. Removal.
- Perform ABS VERIFICATION TEST. ABS Verification Test

No

- Repair the Fused B(+) circuit for an open.
- Perform ABS VERIFICATION TEST. ABS Verification Test