Electronic Brake Control Module: Service Precautions

CAUTION:
- If resistance or continuity checks are performed on the wrong terminals, damage to the vehicle wiring, sensors, ABS-ECU, and/or ohmmeter may occur. Use care to prevent this!

- Always connect and disconnect the scan tool with the ignition switch in the OFF position.

- Short-circuiting the positive (+) probe between a connector terminal and ground could damage the vehicle wiring, the sensor, ABS-ECU, or all three. Use care to prevent this!

- Use the special tool (MB991356), or equivalent to check the ABS-ECU terminal voltage and resistance.

- The ABS-ECU connector terminal arrangement for troubleshooting is different from the terminal arrangement shown on the special tool connector. So take the readings from the terminal numbers of the special tool when checking.


NOTE:
- Measure voltage with the Antilock Brake System (ABS) - Electronic Control Unit (ECU) connectors connected.

- You may find it convenient to pull out the ABS-ECU to make it easier to reach the connector terminals.

- Checks don't have to be carried out in the order given in the chart.

- When measuring resistance and checking continuity, a harness for checking contact pin pressure should be used instead of inserting a test probe.

- Checks do not have to be carried out in the order given in this chart.