Test C: The Climate Control Illumination Is Inoperative

PINPOINT TEST C: THE CLIMATE CONTROL ILLUMINATION IS INOPERATIVE

C1:

C2-C3:

Normal Operation
With the parking lamps on, the lighting control module (LCM) supplies a variable pulse width modulated (PWM) voltage to the electronic automatic temperature control (EATC) module (if equipped) or to the manual climate control on circuit 484 (OG/BK). The EATC has a secondary illumination source which is supplied a constant voltage from the LCM on circuit 19 (LB/RD). The manual climate control illumination is grounded through circuit 57 (BK).

Possible Causes
- circuit 19 (LB/RD) open
- circuit 57 (BK) open
- circuit 484 (OG/BK) open
- EATC module (if equipped)
- manual climate control