Diagnostic Routine AI

Diagnostic Routine AI

Diagnostic Overview

B272F

Refer to Wiring Diagram Set 119 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

DTC Fault Trigger Conditions






Pinpoint Test

NOTICE: When taking measurements at DCSM (Dual Climate Controlled Seat Module) harness connectors, do not insert the electrical probes into the female connector pins. Inserting the probes into connector pins can cause intermittent or open electrical connections after reassembly resulting in DTCs (Diagnostic Trouble Codes) and system failure. Touching the tip of these connector pins is recommended instead.

1. CHECK THE TED (Thermo-Electric Device) BLOWER MOTOR CIRCUITS FOR A SHORT TO VOLTAGE

1. WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

Ignition OFF.

2. Disconnect: Passenger Seat Side Air Bag C339.

3. Disconnect: DCSM (Dual Climate Controlled Seat Module) C3265C.

4. Disconnect: Passenger Cushion TED (Thermo-Electric Device) C3040.

5. Disconnect: Passenger Backrest TED (Thermo-Electric Device) C3039.

6. Ignition ON.

7. Measure:





Is any voltage present?








2. CHECK THE PASSENGER TED (Thermo-Electric Device) BLOWER MOTOR CIRCUITS FOR AN OPEN

1. Measure:





2. Measure:





Are the resistances less than 3 ohms?








3. CHECK THE RESISTANCE OF THE PASSENGER CUSHION AND BACKREST TED (Thermo-Electric Device) BLOWER MOTORS

1. NOTICE: Connect the ohmmeter with the positive lead to pin 2 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected can result in false readings and lead to incorrect identification of components that are not damaged.

Measure:









Are the resistances between 4,000 ohms and 10,000 ohms?








4. CHECK FOR CORRECT DCSM (Dual Climate Controlled Seat Module) OPERATION

1. Ignition OFF.

2. Disconnect and inspect all DCSM (Dual Climate Controlled Seat Module) connectors.

3. Repair:

- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins as necessary
- pushed-out pins - install new pins as necessary

4. Reconnect the DCSM (Dual Climate Controlled Seat Module) connectors. Make sure they seat and latch correctly.

5. Connect: Passenger Backrest TED (Thermo-Electric Device) C3039.

6. Connect: Passenger Cushion TED (Thermo-Electric Device) C3040.

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

Is the concern still present?








5. CHECK FOR SRS (Supplemental Restraint System) DTCs (Diagnostic Trouble Codes)

1. WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

Ignition OFF.

2. Connect: Passenger Seat Side Air Bag C339.

3. Connect: DCSM (Dual Climate Controlled Seat Module) C3265C (if previously disconnected).

4. Connect: Passenger Backrest TED (Thermo-Electric Device) C3039 (if previously disconnected).

5. Connect: Passenger Cushion TED (Thermo-Electric Device) C3040 (if previously disconnected).

6. Ignition ON.

7. Using a scan tool, clear the RCM (Restraints Control Module) DTCs (Diagnostic Trouble Codes).

8. Cycle the ignition OFF then ON.

9. Using a scan tool, perform RCM (Restraints Control Module) self-test.

Are any RCM (Restraints Control Module) DTCs (Diagnostic Trouble Codes) retrieved during self-test?