Without Scan Tool

VEHICLE ON-BOARD DIAGNOSTICS
The heater and A/C programmer and climate control panel (CCP) contains self-diagnostics that, when accessed by on-board diagnostics or a scan tool, are designed to identify the source of any system malfunction as specifically as possible, including whether or not the malfunction is current or the non-current (history) type.

On-board diagnostics only allow the viewing and clearing of the DTC(s). Any tests or overrides must be performed with the scan tool.

To displaying DTCs using on-board diagnostic method:
1. Simultaneously Press "OFF" and "WARMER" (digital IPC) or "OFF" and "PASSENGER WARMER" (analog IPC).
2. Press "LO" (fan speed) button until "XXX?" appears.
3. Press "HI" (fan speed). "XXX CODES?" appears.
4. Press "LO" (fan speed). "XXX CLEAR CODES?" appears.
5. Press "HI" (fan speed) to clear codes. "XXX CODES CLEAR" appears.

NOTE: "XXX" refers to a specific vehicle system:
^ PCM (Powertrain Control Module)
^ TCS (Traction Control System)
^ RTD (Real Time Damping) (with F45 option)
^ BCM (Body Control Module)
^ SDM (Sensing and Diagnostic Module)
^ IPC (Instrument Panel Cluster)
^ RADIO (Radio)
^ HVAC (Heater, Ventilation and Air Conditioning) (with CJ2 option)
^ LDCM (Left Door Control Module)
^ RDCM (Right Door Control Module)
^ SCM (Seat Control Module) (with AAB option)
^ RFA (Remote Function Actuation)