HVAC Module and A/C Compressor Self-Test

During the self-test, the HVAC module will do the following:

• command airflow to PANEL vents
• command temperature blend door actuator to full cold
• set blower speed to level 4 and the 4th level will be displayed on the display
• illuminate the POWER, A/C and RECIRC button indicators
• flash the DEFROST, AUTO and rear window defrost button indicators
• command the A/C compressor to between 1,900 and 2,000 rpm

1. Start the engine.
2. Observe the Electric A/C Compressor Speed (ACCM_ECS) Air Conditioning Compressor Module (ACCM) PID.
3. At the same time, press and release the POWER and DEFROST buttons then, within 2 seconds, press the RECIRC button.
4. Observe the HVAC module actions and A/C compressor speed.
   • If the airflow is incorrect, GO to PINPOINT TEST M .
   • If the panel outlet temperature is incorrect, GO to PINPOINT TEST Q .
   • If the blower is inoperative, GO to PINPOINT TEST R .
   • If the blower speed is incorrect, GO to PINPOINT TEST S .
   • If one or more indicators do not illuminate but the HVAC and A/C compressor operate correctly, INSTALL a new Front Controls Interface Module (FCIM). Refer to DRIVER INFORMATION SYSTEM & ENTERTAINMENT SYSTEM article.
   • If the ACCM_ECS PID reads 0 RPM, GO to PINPOINT TEST O .
   • If the ACCM_ECS PID reads between 1 and 1,899 rpm or greater than 2,000 rpm, INSTALL a new electric A/C compressor. REFER to CLIMATE CONTROL article. TEST the system for normal operation.
   • If all modes in the self-test are achieved, GO to PINPOINT TEST K .
5. To exit the self-test, press any climate control button or turn the ignition OFF.