Diagnostic Test

WARNING: This page is about a different car, the 2012 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.

TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, record and erase DTCs
3. Cycle the Driver Seat Switch in all directions several times.
4. Wait one minute.
5. With the scan tool, read the active DTCs.
  Does the scan tool display B1D5E-13-POWER SEAT SWITCH-CIRCUIT OPEN?
  
  Yes
  - Go To 2.
  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 the POWER SEAT SYSTEM VERIFICATION TEST. Refer to STANDARD PROCEDURE - POWER SEAT SYSTEM VERIFICATION TEST .
CHECKING THE (P28) DRIVER SEAT SWITCH MUX RETURN CIRCUIT

Fig 1: Checking Driver Seat Switch MUX Return Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the Driver Seat Switch harness connector.
3. Measure the resistance between ground and the (P28) Driver Seat Switch Mux Return circuit.
  Is the resistance below 40 Ohms?
  
  Yes
  - Go To 3.
  No
  - Go To 5.
CHECKING THE (P311) DRIVER SEAT FRONT VERTICAL/RECLINER SWITCH MUX CIRCUIT

Fig 2: Measuring Resistance Between Driver Seat Front Vertical/Recliner Switch MUX Circuit & Driver Seat Switch MUX Return Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Connect the Driver Seat Switch harness connector.
2. Disconnect the MSMD C4 harness connector.
3. Measure the resistance between the (P311) Driver Seat Front Vertical/Recliner Switch Mux circuit and the (P28) Driver Seat Switch Mux Return circuit.
  Is the resistance between 40 and 60 Ohms?
  
  Yes
  - Go To 4.
  No
  - Go To 6.
CHECKING THE (P309) DRIVER SEAT REAR VERTICAL/HORIZONTAL SWITCH MUX CIRCUIT

Fig 3: Checking Driver Seat Rear Vertical/Horizontal Switch MUX Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between the (P309) Driver Seat Rear Vertical/Horizontal Switch Mux circuit and the (P28) Driver Seat Switch Mux Return circuit.
  Is the resistance between 40 and 60 Ohms?
  
  Yes
  - Go To 8.
  No
  - Go To 7.
CHECKING THE (P28) DRIVER SEAT SWITCH MUX RETURN CIRCUIT FOR AN OPEN OR EXCESSIVE RESISTANCE

Fig 4: Checking Driver Seat Switch MUX Return Circuit For An Open Or Excessive Resistance
Courtesy of CHRYSLER GROUP, LLC
1. Disconnect the MSMD C4 harness connector.
2. Measure the resistance of the (P28) Driver Seat Switch Mux Return circuit between the Driver Seat Switch harness connector and the MSMD harness connector.
  Is the resistance above 10 Ohms?
  
  Yes
  - Repair the open or excessive resistance in the (P28) Driver Seat Switch Mux Return circuit.
  - Perform the POWER SEAT SYSTEM VERIFICATION TEST. Refer to STANDARD PROCEDURE - POWER SEAT SYSTEM VERIFICATION TEST .
  No
  - Go To 8.
CHECKING THE (P311) DRIVER SEAT FRONT VERTICAL/RECLINER SWITCH MUX CIRCUIT FOR AN OPEN OR EXCESSIVE RESISTANCE

Fig 5: Checking Driver Seat Front Vertical/Recliner Switch MUX Circuit For Open Or Excessive Resistance
Courtesy of CHRYSLER GROUP, LLC
1. Disconnect the Driver Seat Switch harness connector.
2. Measure the resistance of the (P311) Driver Seat Front Vertical/Recliner Switch Mux circuit between the Driver Seat Switch harness connector and the MSMD harness connector.
  Is the resistance above 10 Ohms?
  
  Yes
  - Repair the open or excessive resistance in the (P311) Driver Seat Front Vertical/Recliner Switch Mux circuit.
  - Perform the POWER SEAT SYSTEM VERIFICATION TEST. Refer to STANDARD PROCEDURE - POWER SEAT SYSTEM VERIFICATION TEST .
  No
  - Replace the Driver Seat Switch in accordance with the Service Information.
  - Perform the POWER SEAT SYSTEM VERIFICATION TEST. Refer to STANDARD PROCEDURE - POWER SEAT SYSTEM VERIFICATION TEST .
CHECKING THE (P309) DRIVER SEAT REAR VERTICAL/HORIZONTAL SWITCH MUX CIRCUIT FOR AN OPEN OR EXCESSIVE RESISTANCE

Fig 6: Checking Driver Seat Rear Vertical/Horizontal Switch Mux Circuit For Open Or Excessive Resistance
Courtesy of CHRYSLER GROUP, LLC
1. Disconnect the Driver Seat Switch harness connector.
2. Measure the resistance of the (P309) Driver Seat Rear Vertical/Horizontal Switch Mux circuit between the Driver Seat Switch harness connector and the MSMD harness connector.
  Is the resistance above 10 Ohms.
  
  Yes
  - Repair the open or excessive resistance in the (P309) Driver Seat Rear Vertical/Horizontal Switch Mux circuit.
  - Perform the POWER SEAT SYSTEM VERIFICATION TEST. Refer to STANDARD PROCEDURE - POWER SEAT SYSTEM VERIFICATION TEST .
  No
  - Replace the Driver Seat Switch in accordance with the Service Information.
  - Perform the POWER SEAT SYSTEM VERIFICATION TEST. Refer to STANDARD PROCEDURE - POWER SEAT SYSTEM VERIFICATION TEST .
MEMORY SEAT MODULE (MSMD)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and harness connectors between the Driver Seat Switch and the MSMD.
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Driver Seat Switch and MSMD harness connectors.
4. Perform any Technical Service Bulletins that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWER SEAT SYSTEM VERIFICATION TEST. Refer to STANDARD PROCEDURE - POWER SEAT SYSTEM VERIFICATION TEST .
  No
  - Replace the MSMD in accordance with the Service Information.
  - Perform the POWER SEAT SYSTEM VERIFICATION TEST. Refer to STANDARD PROCEDURE - POWER SEAT SYSTEM VERIFICATION TEST .