D4 Check For Loss of Brake Input to Antilock Control Unit

- Remove the anti-lock electronic control module harness connector from the anti-lock electronic control module. Check for terminal back-out.

- Set multimeter to 20 VDC range.

- Press on brake pedal hard enough to turn on rear brake lights.

- Measure voltage from RABS harness connector Pin 11 to chassis ground while brake pedal is pressed.

- Are 9 volts or more present?

YES -- Leave anti-lock electronic control module disconnected. Go to D5. [1][2]D5 - Check Power to the RABS Electronic Control Module

NO -- Repair open in Circuit 511 (LG). Reconnect anti-lock electronic control module. Repeat System Pre-Check. Initial Inspection and Diagnostic Overview