Diagnostic Routine W

Diagnostic Routine W

Diagnostic Overview

B19A2

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 PASSENGER BACKREST TED (Thermo-Electric Device) BLOWER SPEED CONTROL CIRCUIT 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. Ignition ON.

5. Measure:





Is any voltage present?








2. CHECK THE PASSENGER BACKREST TED (Thermo-Electric Device) BLOWER SPEED CONTROL CIRCUIT FOR A SHORT TO VOLTAGE

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

2. Measure:





Is any voltage present?








3. CHECK THE PASSENGER BACKREST TED (Thermo-Electric Device) BLOWER SPEED CONTROL AND BLOWER OUTPUT CIRCUITS FOR A SHORT TOGETHER

1. Ignition OFF.

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

3. Measure:





Is the resistance greater than 10,000 ohms?








4. CHECK THE BACKREST TED (Thermo-Electric Device) RESISTANCE FOR AN INTERNAL SHORT

1. Measure:





Is the resistance greater than 2,000,000 ohms?








5. 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 (if previously disconnected).

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

Is the concern still present?








6. 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.

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

5. Ignition ON.

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

7. Cycle the ignition OFF then ON.

8. 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?