System Precautions

CAUTION: See the ANTI-LOCK BRAKE SAFETY PRECAUTIONS article in the GENERAL INFORMATION section.

Before proceeding with diagnosis, read and observe following precautions:

Ensure battery is fully charged and charging system is functional.
Probe Controller Anti-Lock Brake (CAB) connector from pin side. DO NOT backprobe CAB connector. Probe connector terminal carefully. DO NOT spread terminal, as this could cause intermittent problem.
When using a jumper wire, ensure either the jumper wire or circuit is fuse-protected.
DO NOT cause short circuits when performing electrical tests. This will set additional DTCs, making diagnosis of original problem more difficult.
DO NOT unplug or plug CAB connector with ignition on.
Use scan tool voltmeter unless instructed to use an external voltmeter.
DO NOT use test light in place of voltmeter.
Use scan tool in ohmmeter mode unless instructed to use an external ohmmeter.
Always perform TEST VER-1A under SELF-DIAGNOSTIC TESTS after repairs are made.
Always disconnect scan tool when done.
Always disconnect scan tool before charging battery.