Antilock Brakes / Traction Control Systems: Service Precautions

When working on this system, observe the following precautions:
- Before welding on the vehicle with an electric welding unit, complete the following steps:
^ Turn the ignition switch OFF.
^ Disconnect the Electronic Brake Control Module (EBCM) connectors. Do not use a fast charger for starting the engine.
^ Disconnect the negative battery cable when fast charging.
- Do not use a fast charger for starting the engine.
- Disconnect the negative battery cable when fast charging.

CAUTION: Before removing or installing any electrical unit or when a tool or equipment could easily come in contact with "live" exposed electrical terminals, disconnect the negative battery cable to help prevent personal injury and/or damage to the vehicle or components. Unless instructed otherwise, the ignition switch must be in the "OFF" or "LOCK" position.

- Never disconnect the battery from the vehicle electrical system while the engine is running.
- Connect all wiring harness connectors securely.
- Proper speed sensor wiring, routing and retaining are necessary in order to prevent false signals due to electrical noise. You can achieve proper system operation only by restoring the system to its original condition.
When servicing the ABS system, note the routing, position, mounting and locations of the following items:
^ All components
^ The wiring
^ The connectors
^ The clips
^ The brackets
^ The brake pipes
Follow the above mentioned precautions when working on ABS. Familiarize yourself with ABS and it relationships with other components on the vehicle.