PINPOINT TEST E : The Auxiliary Temperature, Mode, and Blower Motor Controls Are Inoperative Or Do Not Operate Correctly Using the Rear Auxiliary Controls Only
- E1 CHECK THE CIRCUIT BETWEEN THE HVAC MODULE AND THE AUXILIARY CLIMATE CONTROL ASSEMBLY FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Auxiliary Climate Control Assembly.
- Disconnect: HVAC Module C228B.
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C228B-24 Ground C228B-14 Ground C228B-5 Ground C228B-11 Ground C228B-10 Ground C228B-9 Ground
Is voltage present on any of the circuits?
Yes REPAIR the circuit in question. No GO to E2. - E2 CHECK THE CIRCUIT BETWEEN THE HVAC MODULE AND THE AUXILIARY CLIMATE CONTROL ASSEMBLY FOR A SHORT TO GROUND
- Ignition OFF.
- Measure:
Positive Lead Measurement / Action Negative Lead C228B-24 Ground C228B-14 Ground C228B-5 Ground C228B-11 Ground C228B-10 Ground C228B-9 Ground
Are the resistances greater than 10, 000 ohms?
Yes GO to E3. No REPAIR the circuit in question. - E3 CHECK THE CIRCUIT BETWEEN THE HVAC MODULE AND THE AUXILIARY CLIMATE CONTROL ASSEMBLY FOR AN OPEN
- Disconnect: HVAC Module C228B.
- Measure:
Positive Lead Measurement / Action Negative Lead C228B-24 C3198B-2 C228B-14 C3198B-3 C228B-5 C3198B-4 C228B-11 C3198B-6 C228B-10 C3198B-7 C228B-9 C3198B-8 Positive Lead Measurement / Action Negative Lead C228A-24 C3198B-5 C228A-23 C3198B-1
Are the resistances less than 3 ohms?
Yes INSTALL a new auxiliary climate control assembly. Refer to Auxiliary Climate Control Assembly . TEST the system for normal operation. If the condition returns, GO to E4. No REPAIR the circuit in question. - E4 CHECK FOR CORRECT HVAC MODULE OPERATION
- Ignition OFF.
- Disconnect and inspect all HVAC module connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the HVAC module connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new HVAC module. For EMTC, REFER to Climate Control - EMTC . For DAMB, REFER to Climate Control - DATC . No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
