Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. With the scan tool, read Memory Seat Module-Driver (MSMD) DTCs and record on the work order.
2. Record the DTC Environmental Data.
3. With the scan tool, erase MSMD DTCs.
4. Turn the ignition off.
5. Turn the ignition on.
6. Cycle the Power Seat Switch to all positions.
7. With the scan tool, read MSMD DTCs.
  Does the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK THE DRIVER SEAT SWITCH CONNECTION
1. Turn the ignition off.
2. Inspect the Driver Seat Switch component connector, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - 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.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  No
  - Go To 3
CHECK THE DRIVER SEAT SWITCH
1. Replace the Driver Seat Switch in accordance with the Service Information. Refer to SWITCH, SEAT, POWER, REMOVAL AND INSTALLATION .
2. Perform the POWER SEAT SYSTEM VERIFICATION TEST. Refer to POWER SEAT SYSTEM VERIFICATION TEST .
  Did the DTC return?
  
  Yes
  - Go To 4
  No
  - Replacing the Driver Seat Switch repaired the fault.
  - Test complete.
CHECK THE (P599) DRIVER SEAT SWITCH MUX RETURN CIRCUIT FOR AN OPEN
1. Disconnect the MSMD C7 harness connector.
2. Disconnect the Driver Seat Switch harness connector.
3. Measure the resistance of the (P599) Driver Seat Switch Mux Return circuit between the MSMD C7 harness connector and the Driver Seat Switch harness connector.
  Is the resistance below 1.0 Ohm?
  
  Yes
  - Go To 5
  No
  - Repair the (P599) Driver Seat Switch Mux Return circuit for an open or high resistance.
  - Perform the POWER SEAT SYSTEM VERIFICATION TEST. Refer to POWER SEAT SYSTEM VERIFICATION TEST .
CHECK THE (P339) DRIVER SEAT SWITCH FRONT VERTICAL/RECLINER SWITCH MUX CIRCUIT FOR AN OPEN
1. Measure the resistance of the (P339) Driver Seat Switch Front Vertical/Recliner Switch Mux circuit between the MSMD C7 harness connector and the Driver Seat Switch harness connector.
  Is the resistance below 1.0 Ohm?
  
  Yes
  - Go To 6
  No
  - Repair the (P339) Driver Seat Switch Front Vertical/Recliner Switch Mux circuit for an open or high resistance.
  - Perform the POWER SEAT SYSTEM VERIFICATION TEST. Refer to POWER SEAT SYSTEM VERIFICATION TEST .
CHECK THE (P239) DRIVER SEAT SWITCH REAR VERTICAL/HORIZONTAL SWITCH MUX CIRCUIT FOR AN OPEN
1. Measure the resistance of the (P239) Driver Seat Switch Rear Vertical/Horizontal Switch Mux circuit between the MSMD C7 harness connector and the Driver Seat Switch harness connector.
  Is the resistance below 1.0 Ohm?
  
  Yes
  - Go To 7
  No
  - Repair the (P239) Driver Seat Switch Rear Vertical/Horizontal Switch Mux circuit for an open or high resistance.
  - Perform the POWER SEAT SYSTEM VERIFICATION TEST. Refer to POWER SEAT SYSTEM VERIFICATION TEST .
CHECK THE (P99) SEAT SWITCH B(+) SUPPLY CIRCUIT FOR AN OPEN
1. Measure the resistance of the (P99) Seat Switch B(+) Supply circuit between the MSMD C7 harness connector and the Driver Seat Switch harness connector.
  Is the resistance below 1.0 Ohm?
  
  Yes
  - Go To 8
  No
  - Repair the (P99) Seat Switch B(+) Supply circuit for an open or high resistance.
  - Perform the POWER SEAT SYSTEM VERIFICATION TEST. Refer to POWER SEAT SYSTEM VERIFICATION TEST .
CHECK RELATED HARNESS CONNECTIONS
1. Turn the ignition off.
2. Disconnect all MSMD harness connectors.
3. Disconnect all related in-line harness connections (if equipped).
4. Disconnect the related component harness connectors.
5. 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.
  - Perform a terminal drag test on each connector terminal to verify proper terminal tension.
  Repair any conditions that are found.
6. Reconnect all MSMD harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
9. With the scan tool, erase DTCs.
10. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
11. With the scan tool, read MSMD DTCs.
  Did the DTC return?
  
  Yes
  - Replace and program the Memory Seat Module-Driver (MSMD) in accordance with the Service Information. Refer to MODULE, MEMORY, SEAT (MSM), REMOVAL AND INSTALLATION .
  - Perform the POWER SEAT SYSTEM VERIFICATION TEST. Refer to POWER SEAT SYSTEM VERIFICATION TEST .
  No
  - Perform the POWER SEAT SYSTEM VERIFICATION TEST. Refer to POWER SEAT SYSTEM VERIFICATION TEST .
  - Test complete.