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U0125






U0125-00-LOST COMMUNICATION WITH MULTI - AXIS ACCELERATION SENSOR MODULE





For a complete wiring diagram, refer to the Wiring Information.

NOTE: The Electronic Stability Control (ESC) may also be referred to as Electronic Stability Program (ESP) depending on the vehicle model year and configuration. Certain components may also reference ESP, ESC, or use the traction control symbol.

- When Monitored:
With the ignition on.

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





1. VERIFY THE DTC IS ACTIVE

NOTE: If DTC C2114-16, C2114-17 or U1003-88 are present, perform the diagnostics for these DTCs before continuing with this diagnostic procedure. C2114 U1003

1. Turn the ignition on.
2. Using the scan tool, read and record ABS DTCs.
3. Using the scan tool, read and record Environmental Data (EV Data).
4. Using the scan tool, erase ABS DTCs.
5. Cycle the ignition switch.
6. Using the scan tool, read ABS DTCs.

Is the DTC active at this time?

Yes

- Go To 2

No

- Perform the ABS Intermittent Condition diagnostic procedure. ABS Intermittent Condition Test.

2. INSPECT RELATED WIRING HARNESS, TERMINALS, AND CONNECTORS
1. Turn the ignition off to the lock position.

WARNING: To avoid serious or fatal injury on vehicles equipped with airbags, disable the Supplemental Restraint System (SRS) before attempting any steering wheel, steering column, airbag, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the SRS. Failure to take the proper precautions could result in accidental airbag deployment.

NOTE: Proper Steering Angle Sensor installation is crucial for proper operation.

2. Visually inspect the related wiring harness. Look for any pinched, chafed, pierced, and partially broken wires.
3. 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 the ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 3

3. (G4) DYNAMICS SENSOR SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE




1. Disconnect the ABS Module harness connector.
2. Disconnect the Dynamics Sensor harness connector.
3. Measure the resistance of the (G4) Dynamics Sensor Supply 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 4

No

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

4. (Z912) GROUND CIRCUIT OPEN OR HIGH RESISTANCE




1. Using a 12-volt test light connected to B+, check the (Z912) Ground circuit at the Dynamics Sensor harness connector.

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly?

Yes

- Go To 5

No

- Repair the (Z912) Ground circuit for an open or high resistance.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

5. CHECK THE (D465) DYNAMICS SENSOR HIGH DATA LINK CIRCUIT FOR A SHORT TO VOLTAGE




1. Turn the ignition on.
2. Measure the voltage of the (D465) Dynamics Sensor High Data Link circuit.

Is there any voltage present?

Yes

- Repair the (D465) Dynamics Sensor High Data Link circuit for a short to voltage.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 6

6. CHECK THE (D465) DYNAMICS SENSOR HIGH DATA LINK CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition off.
2. Measure the resistance of the (D465) Dynamics Sensor High Data Link circuit between ground and the Dynamics Sensor harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Repair the (D465) Dynamics Sensor High Data Link circuit for a short to ground.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 7

7. CHECK THE (D465) DYNAMICS SENSOR HIGH DATA LINK CIRCUIT FOR AN OPEN




1. Measure the resistance of the (D465) 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 8

No

- Repair the (D465) Dynamics Sensor High Data Link circuit for an open.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

8. CHECK THE (D464) DYNAMICS SENSOR LOW DATA LINK CIRCUIT FOR A SHORT TO VOLTAGE




1. Turn the ignition on.
2. Measure the voltage of the (D464) Dynamics Sensor Low Data Link circuit.

Is there any voltage present?

Yes

- Repair the (D464) Dynamics Sensor Low Data Link circuit for a short to voltage.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 9

9. CHECK THE (D464) DYNAMICS SENSOR LOW DATA LINK CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition off.
2. Measure the resistance of the (D464) Dynamics Sensor Low Data Link circuit between ground and the Dynamics Sensor harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Repair the (D464) Dynamics Sensor Low Data Link circuit for a short to ground.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 10

10. CHECK THE (D464) DYNAMICS SENSOR LOW DATA LINK CIRCUIT FOR AN OPEN




1. Measure the resistance of the (D464) Dynamics Sensor Low Data Link circuit between the Dynamics Sensor harness connector and the ABS Module harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Go To 11

No

- Repair the (D464) Dynamics Sensor Low Data Link circuit for an open.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

11. (D465) DYNAMICS SENSOR HIGH DATA LINK CIRCUIT SHORTED TO THE (D464) DYNAMICS SENSOR LOW DATA LINK CIRCUIT




1. Turn the ignition off.
2. Measure the resistance between the (D465) Dynamics Sensor High Data Link circuit and the (D464) Dynamics Sensor Low Data Link circuit at the ABS Module harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Repair the (D464) Dynamics Sensor Low Data Link circuit for a short to (D465) Dynamics Sensor High Data Link circuit.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 12

12. CHECK FOR DTC U0125-00-LOST COMMUNICATION WITH MULTI-AXIS ACCELERATION SENSOR MODULE
1. Replace the Dynamics Sensor. Dynamics Sensor - Removal.Perform the ABS VERIFICATION TEST. ABS Verification Test.
2. Turn the ignition on.
3. With the scan tool, record and erase DTCs.
4. Cycle the ignition switch from off to on.
5. With the scan tool, read DTCs.

Does the DTC reset?

Yes

- Replace the Anti-lock Brake System (ABS) Module. Anti-Lock Brake System Module - Removal.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Test complete.

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