Diagnostic Test

CHECK PCM FOR CHARGING SYSTEM DTC
1. Turn the ignition on.
2. With the scan tool, read PCM DTCs.
  Are there any Charging System DTCs set in the PCM?
  
  Yes
  - Refer to the DTC INDEX article for Charging System diagnostic procedures.
  No
  - Go To 2
CHECK FOR AN ACTIVE DTC
1. With the scan tool, clear all DTCs.
2. Turn the ignition switch to the off position then start the engine and operate the heated seats for one minute.
3. With the scan tool, read DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 3
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension.
  - Perform BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
(P693) FUSED RUN RELAY OUTPUT CIRCUIT HIGH RESISTANCE
1. Start the engine and let idle.
2. Disconnect the Heated Seats Module harness connector.
3. Using a 12-volt test light connected to ground, check the (P693) Fused Run Relay Output circuit.
  NOTE:
  The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
  
  Does the test light illuminate brightly?
  
  Yes
  - Replace the Heated Seat Module (HSM) in accordance with the Service Information.
  - Perform BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair the (P693) Fused Ignition Switch Output (Run) circuit as necessary.
  - Perform BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .