C1671-1: Check Circuit 74 (BL) Input to Anti-Lock Brake Module

- Turn ignition switch to the OFF position.

- Connect Rotunda 60-Pin Breakout Box 007-00033 with Rotunda ABS Breakout Box Adapter 007-00115 or equivalents to the anti-lock brake control module.

- Turn ignition switch to the RUN position.

- Using a Rotunda 73 Digital Multimeter 105-R0051 or equivalent set to volts DC, measure voltage between breakout box pins 5 and 21.

- Is voltage 10 volts or more?

YES -- Go to C1671-2. C1671-2: Check Anti-Lock Brake Indicator

NO -- Go to C1671-4. C1671-4: Check Continuity of Circuit 74 (BL)