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Diagnostic Test

  1. CHECK PCM FOR CHARGING SYSTEM DTCS 
    1. With the scan tool, read Powertrain Control Module (PCM) DTCs and record on the repair order.

      Are there any PCM Charging or Battery DTCs present?

      Yes 

      • Repair the PCM DTC(s). Refer to DTC INDEX .

      No 

      • Go To  2
  2. CHECK OTHER MODULES FOR DTCS 
    1. With the scan tool, read DTCs.

      Are there any other modules setting a low system voltage DTC?

      Yes 

      • This is either an indication of an overall low system voltage or one or more power circuits with a high resistance in its output circuit. Using the wiring schematics as a guide, look for a common power circuit between the modules that set a low voltage DTC and repair as necessary. If it seems to be an overall low system voltage, check the battery and charging system in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK FOR AN ACTIVE DTC 
    1. With the scan tool, read Heated Seat Module (HSM) DTCs and record on the repair order.
    2. With the scan tool, erase HSM DTCs.
    3. Turn the ignition off.
    4. Start the engine and let it run for one minute.
    5. With the scan tool, read HSM DTCs.

      Did the DTC return?

      Yes 

      • Go To  4

      No 

  4. CHECK THE (F921) FUSED CIRCUIT FOR HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Disconnect the HSM C1 harness connector.
    3. Start the Engine.
    4. With a 12-volt test light connected to ground, check the (F921) Fused Ignition circuit at the HSM C1 harness connector.
      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 

      • Go To  5.

      No 

      • Repair the (F921) Fused Ignition circuit for high resistance.
      • Perform BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  5. CHECK THE (F922) FUSED CIRCUIT FOR HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Disconnect the HSM C3 harness connector.
    3. Start the Engine.
    4. With a 12-volt test light connected to ground, check the (F922) Fused Ignition circuit at the HSM C3 harness connector.
      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 

      • Go To  6

      No 

      • Repair the (F922) Fused Ignition circuit for high resistance.
      • Perform BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  6. CHECK (Z917) GROUND CIRCUIT FOR HIGH RESISTANCE 
    1. With a 12-volt test light connected to 12 volts, check the (Z917) Ground circuit in the HSM C1 harness connector.

      Does the test light illuminate brightly?

      Yes 

      • Go To  7

      No 

      • Repair the (Z917) Ground circuit for high resistance.
      • Perform BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  7. CHECK RELATED HARNESS CONNECTIONS 
    1. Disconnect all HSM harness connectors.
    2. Disconnect all related in-line harness connections (if equipped).
    3. Disconnect the related component harness connectors.
    4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Check for spread terminals and verify proper terminal tension.

      Repair any conditions that are found.

    5. Connect all HSM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    6. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    7. Connect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. With the scan tool, erase DTCs.
    9. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    10. With the scan tool, read HSM DTCs.

      Is the same DTC active?

      Yes 

      No 

      • Repairing the wiring harness or connections corrected the problem.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
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