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U0125







U0125-LOST COMMUNICATION WITH DYNAMICS SENSOR





For a complete wiring diagram consult Diagrams/Electrical.


- When Monitored:
With the ignition on.

- Set Condition:
If the Anti-Lock Brakes Module fails to receive bus messages from the Dynamics Sensor.








Diagnostic Test


1. VERIFY DTC IS ACTIVE
NOTE: If present, diagnose and repair DTC C2114-DYNAMICS SENSOR SUPPLY VOLTAGE LOW or DTC C2115-DYNAMICS SENSOR SUPPLY VOLTAGE HIGH before proceeding.

Turn the ignition on.
With the scan tool, read and record ABS DTCs.
With the scan tool, read and record Environmental Data (EV Data).
With the scan tool, erase ABS DTCs.
Cycle the ignition switch.
With the scan tool, read ABS DTCs.
Does this DTC reset?

Yes


- Go To 2


No



- Refer to the ABS-INTERMITTENT CONDITION TEST. Testing and Inspection




2. INSPECT RELATED WIRING HARNESS, TERMINALS, & CONNECTORS
Visually inspect the related wiring harness. Look for any pinched, chafed, pierced, and partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, and corroded terminals.
Were any problems found?

Yes


- Repair as necessary.
- Perform ABS VERIFICATION TEST. ABS Verification Test.


No


- Go To 3




3. CHECK THE VOLTAGE ON THE (G4) DYNAMICS SENSOR SUPPLY CIRCUIT




Turn the ignition off.
Disconnect the Dynamics Sensor harness connector.
Turn the ignition on.
Measure the voltage of the (G4) Dynamics Sensor Supply Circuit.
Is the voltage above 10 volts?

Yes


- Go To 7


No


- Go To 4




4. (G4) DYNAMICS SENSOR SUPPLY CIRCUIT SHORT TO GROUND




Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Measure the resistance between ground and the (G4) Dynamics Sensor Supply circuit.
Is the resistance below 5.0 ohms?

Yes


- Repair the (G4) Dynamics Sensor Supply circuit for a short to ground.
- Perform ABS VERIFICATION TEST. ABS Verification Test.


No


- Go To 5




5. (G4) DYNAMICS SENSOR SUPPLY CIRCUIT SHORT TO VOLTAGE




Turn the ignition on.
Measure the voltage of the (G4) Dynamics Sensor Supply circuit.
Is there any voltage present?

Yes


- Repair the (G4) Dynamics Sensor Supply circuit for a short to voltage.
- Perform ABS VERIFICATION TEST. ABS Verification Test.


No


- Go To 6




6. (G4) DYNAMICS SENSOR SUPPLY CIRCUIT OPEN
Turn the ignition off.
Measure the resistance of the (G4) Dynamics Sensor Supply circuit.
Is the resistance below 5.0 ohms?

Yes


- Replace the Anti-Lock Brake Module.
- Perform ABS VERIFICATION TEST. ABS Verification Test.


No


- Repair the (G4) Dynamics Sensor Supply circuit for an open.
- Perform ABS VERIFICATION TEST. ABS Verification Test.




7. CHECK THE RESISTANCE BETWEEN THE (G94) DYNAMICS SENSOR GROUND CIRCUIT AND GROUND




Disconnect the Dynamics Sensor harness connector.
Measure the resistance between the (G94) Dynamics Sensor Ground Circuit and Ground.
Is the resistance below 5.0 ohm?

Yes


- Go To 10


No


- Go To 8




8. (G94) DYNAMICS SENSOR GROUND CIRCUIT SHORT TO VOLTAGE




Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Turn the ignition on.
Measure the voltage of the (G94) Dynamics Sensor Ground circuit.
Is there any voltage present?

Yes


- Repair the (G94) Dynamics Sensor Ground circuit for a short to voltage.
- Perform ABS VERIFICATION TEST. ABS Verification Test.


No


- Go To 9




9. (G94) DYNAMICS SENSOR GROUND CIRCUIT OPEN
Turn the ignition off.
Measure the resistance of the (G94) Dynamics Sensor Return circuit.
Is the resistance below 5.0 ohms?

Yes


- Replace the Anti-Lock Brake Module.
- Perform ABS VERIFICATION TEST. ABS Verification Test.


No


- Repair the (G94) Dynamics Sensor Ground circuit for an open.
- Perform ABS VERIFICATION TEST. ABS Verification Test.




10. CHECK THE DYNAMICS SENSOR OUTPUT
CAUTION: All previously removed connectors must be connected before test driving the vehicle.

CAUTION: Ensure brake capability is available before road testing.

Have an assistant test drive the vehicle while monitoring the Dynamics Sensor operation.
Was the Lateral Sensor output between 0.02 G to 0.16 G and the Yaw Sensor between 1.30° to 5.70°

Yes


- Replace the Anti-Lock Brake Module.
- Perform ABS VERIFICATION TEST. ABS Verification Test.


No


- Go To 11




11. CHECK THE (D52) DYNAMICS SENSOR HIGH DATA LINK CIRCUIT FOR A SHORT TO VOLTAGE




Disconnect the Anti-Lock Brakes Module harness connector.
Disconnect the Dynamics Sensor harness connector.
Turn the ignition on.
Measure the voltage of the (D52) Dynamics Sensor High Data Link circuit.
Is there any voltage present?

Yes


- Repair the (D52) Dynamics Sensor High Data Link circuit for a short to voltage.
- Perform ABS VERIFICATION TEST. ABS Verification Test.


No


- Go To 12




12. CHECK THE (D52) DYNAMICS SENSOR HIGH DATA LINK CIRCUIT FOR A SHORT TO GROUND




Turn the ignition off.
Measure the resistance of the (D52) Dynamics Sensor High Data Link circuit between ground and the Dynamics Sensor harness connector.
Is the resistance below 5.0 ohms?

Yes


- Repair the (D52) Dynamics Sensor High Data Link circuit for a short to ground.
- Perform ABS VERIFICATION TEST. ABS Verification Test.


No


- Go To 13




13. CHECK THE (D52) DYNAMICS SENSOR HIGH DATA LINK CIRCUIT FOR AN OPEN




Measure the resistance of the (D52) Dynamics Sensor High Data Link circuit between the Dynamics Sensor harness connector and the Anti-Lock Brakes Module harness connector.
Is the resistance below 5.0 ohms?

Yes


- Go To 14


No


- Repair the (D52) Dynamics Sensor High Data Link circuit for an open.
- Perform ABS VERIFICATION TEST. ABS Verification Test.




14. CHECK THE (D51) DYNAMICS SENSOR LOW DATA LINK CIRCUIT FOR A SHORT TO VOLTAGE




Turn the ignition on.
Measure the voltage of the (D51) Dynamics Sensor Low Data Link circuit.
Is there any voltage present?

Yes


- Repair the (D51) Dynamics Sensor Low Data Link circuit for a short to voltage.
- Perform ABS VERIFICATION TEST. ABS Verification Test.


No


- Go To 15




15. CHECK THE (D51) DYNAMICS SENSOR LOW DATA LINK CIRCUIT FOR A SHORT TO GROUND




Turn the ignition off.
Measure the resistance of the (D51) Dynamics Sensor Low Data Link circuit between ground and the Dynamics Sensor harness connector.
Is the resistance below 5.0 ohms?

Yes


- Repair the (D51) Dynamics Sensor Low Data Link circuit for a short to ground.
- Perform ABS VERIFICATION TEST. ABS Verification Test.


No


- Go To 16




16. CHECK THE (D51) DYNAMICS SENSOR LOW DATA LINK CIRCUIT FOR AN OPEN




Measure the resistance of the (D51) Dynamics Sensor Low Data Link circuit between the Dynamics Sensor harness connector and the Anti-Lock Brakes Module harness connector.
Is the resistance below 5.0 ohms?

Yes


- Replace the Dynamics Sensor.
- Perform ABS VERIFICATION TEST. ABS Verification Test.


No


- Repair the (D51) Dynamics Sensor Low Data Link circuit for an open.
- Perform ABS VERIFICATION TEST. ABS Verification Test.

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