Q2 Check Stoplight Switch

- Connect Rotunda EEC-IV Breakout Box 014-00322 or equivalent with Anti-Lock Test Adapter T90P-50-ALA to the anti-lock 55-pin connector on the wire harness.

- Turn ignition switch to ON position.

- Measure voltage between breakout box pins 32 and 60.

NOTE: Do not apply brake pedal while performing this test.

- Are there 12 volts?

YES -- Replace stoplamp switch or service circuit 511 (LG). Restore vehicle. Retest system.

NO -- Go to Q3. Q3 Check ABS Function