U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULE

For a complete wiring diagram, refer to the Wiring Information.

When Monitored:
- With the ignition on
- Battery voltage between 10 and 16 volts
- Ignition Off Draw (IOD) fused installed.
Set Condition:
If the Occupant Restraint Controller (ORC) Bus messages not received from the Antilock Brake Module (ABS) for approximately two to five seconds.

Possible Causes
(D65) CAN C BUS(+) CIRCUIT SHORTED TO VOLTAGE
(D64) CAN C BUS(-) CIRCUIT SHORTED TO GROUND
DTCs RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
TIPM NOT CONFIGURED CORRECTLY
ANTILOCK BRAKE MODULE POWER AND GROUND
ANTILOCK BRAKE MODULE
OCCUPANT RESTRAINT CONTROLLER (ORC)

VERIFY DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE

NOTE: Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

1.	Turn the ignition on.

2.	With the scan tool, read ORC DTCs.

Is the U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULE DTC active?

Yes

(Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Diagnosis and Testing) and perform the U0121-Lost Communication with Anti-lock Brake System (ABS) Control Module diagnostic procedure.