D4 - Check For Loss of Brake Input to Antilock Control Unit

- Remove the module harness connector from the antilock electronic control unit. Check for terminal back-out.

- Set voltmeter 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.

- Is voltage greater than 9 volts?

YES -- Leave antilock electronic control unit disconnected. Go to D5. [1][2]D5 - Check Power to the Antilock Electronic Unit

NO -- Repair open in circuit 511 (LG). Reconnect antilock electronic control unit. Repeat System Pre-Check. [1][2]System Pre-Check Pinpoint Tests