Test C: The Climate Control Illumination Is Inoperative

PINPOINT TEST C: THE CLIMATE CONTROL ILLUMINATION IS INOPERATIVE

C1:

C1-C3:

C4:

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 and the manual climate control illumination is grounded through circuit 57 (BK). The driver door module (DDM) also generates a secondary variable voltage which is distributed to the EATC module on circuit 19 (LB/RD).

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