Symptom Chart

SYMPTOM

Condition	Possible Sources	Action
No communication with the instrument cluster	Circuitry. Standard corporate protocol (SCP) communication network. Universal asynchronous receiver-transmitter (UART) based protocol (UBP) communication network. Instrument cluster.	GO To PINPOINT TEST G: NO COMMUNICATION WITH THE INSTRUMENT CLUSTER .
One or more module-controlled illumination source(s) is inoperative	Circuitry. Illumination LEDs (part of illumination source component). Dimmer module.	GO To PINPOINT TEST A: ONE OR MORE MODULE-CONTROLLED ILLUMINATION SOURCES IS INOPERATIVE .
The control illumination is inoperative/always on	Circuitry. Headlamp switch.	GO To PINPOINT TEST B: THE CONTROL ILLUMINATION IS INOPERATIVE/ALWAYS ON .
The instrument cluster illumination is inoperative	Circuitry. Illumination LEDs. Instrument cluster.	Go To PINPOINT TEST C: THE INSTRUMENT CLUSTER ILLUMINATION IS INOPERATIVE .
The climate control illumination is inoperative	Circuitry. Dual automatic temperature control (DATC) unit.	Go To PINPOINT TEST D: THE CLIMATE CONTROL ILLUMINATION IS INOPERATIVE .
The steering wheel control switch is inoperative	Circuitry. Clockspring. Steering wheel control switches. Steering wheel control harness.	Go To PINPOINT TEST E: THE STEERING WHEEL CONTROL SWITCH IS INOPERATIVE .
The instrument panel illumination does not dim	Circuitry. Dimmer switch. Dimmer module.	Go To PINPOINT TEST F: THE INSTRUMENT PANEL ILLUMINATION DOES NOT DIM .