Climate Control - EMTC

Diagnostic Routine E

Diagnostic Overview

U0140:00

DTC Fault Trigger Conditions






Pinpoint Test

1. VERIFY THE CUSTOMER CONCERN

1. Ignition ON.

2. Verify there is an observable symptom present.

Is an observable symptom present?








2. CHECK THE COMMUNICATION NETWORK

1. Ignition ON.

2. Using a scan tool, perform the network test.

Does the BCM (Body Control Module) pass the network test?








3. RETRIEVE THE RECORDED DTCs (Diagnostic Trouble Codes) FROM THE BCM (Body Control Module) SELF-TEST

1. Using a scan tool, perform BCM (Body Control Module) self-test.

2. Check for recorded DTCs (Diagnostic Trouble Codes) from the BCM (Body Control Module) self-test.

Is DTC (Diagnostic Trouble Code) U3003:16 or DTC (Diagnostic Trouble Code) U3003:17 recorded?








4. RETRIEVE THE RECORDED DTCs (Diagnostic Trouble Codes) FROM THE HVAC (Heating, Ventilation, and Air Conditioning) MODULE SELF-TEST

1. Using a scan tool, perform HVAC (Heating, Ventilation, and Air Conditioning) Module self-test.

2. Check for recorded DTCs (Diagnostic Trouble Codes) from the HVAC (Heating, Ventilation, and Air Conditioning) module self-test.

Is DTC (Diagnostic Trouble Code) U3003:16 or DTC (Diagnostic Trouble Code) U3003:17 recorded?








5. RECHECK THE HVAC (Heating, Ventilation, and Air Conditioning) MODULE DTCs (Diagnostic Trouble Codes)

NOTE: If new modules were installed prior to the DTC (Diagnostic Trouble Code) being set, the module configuration may be incorrectly set during the PMI (Programmable Module Installation) or the PMI (Programmable Module Installation) may not have been carried out.

1. Clear the DTCs (Diagnostic Trouble Codes).

2. Wait 10 seconds.

3. Using a scan tool, repeat the HVAC (Heating, Ventilation, and Air Conditioning) module self-test.

Is DTC (Diagnostic Trouble Code) U0140:00 still present?








6. CHECK FOR DTC (Diagnostic Trouble Code) U0140:00 SET IN OTHER MODULES

1. Clear all DTCs (Diagnostic Trouble Codes).

2. Ignition OFF.

3. Ignition ON.

4. Wait 10 seconds.

5. Using a scan tool, perform a self-test.

6. Retrieve the continuous memory DTCs (Diagnostic Trouble Codes) from all modules.

Is DTC (Diagnostic Trouble Code) U0140:00 set in the DSM (Driver Seat Module)?








7. CHECK FOR CORRECT BCM (Body Control Module) OPERATION

1. Ignition OFF.

2. Disconnect and inspect all BCM (Body Control Module) connectors.

3. 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

4. Reconnect the BCM (Body Control Module) connectors. Make sure they seat and latch correctly.

5. Operate the system and determine if the concern is still present.

Is the concern still present?








8. CHECK FOR CORRECT HVAC (Heating, Ventilation, and Air Conditioning) MODULE OPERATION

1. Ignition OFF.

2. Disconnect and inspect all HVAC (Heating, Ventilation, and Air Conditioning) module connectors.

3. 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

4. Reconnect the HVAC (Heating, Ventilation, and Air Conditioning) module connectors. Make sure they seat and latch correctly.

5. Operate the system and determine if the concern is still present.

Is the concern still present?