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Home >> Chrysler >> 2004 >> Pacifica AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Body Diagnostic Procedures - Communication, Door Ajar, Electrically Heated Systems, Exterior Lighting >> Electrically Heated Systems >> Symptom: PASSENGER SEAT HEAT OUTPUT OPEN - MHSAPM >> Diagnostic Procedure

Diagnostic Procedure

PASSENGER SEAT HEAT OUTPUT OPEN - MHSAPM - DIAGNOSTIC PROCEDURE

TEST ACTION APPLICABILITY
1 With the DRBIII®, erase the DTC from Memory/Heated Seat Adjustable Pedal Module.
Turn the ignition switch to the Off position then start the engine and let run for one minute.
Operate the heated seat system.
With the DRBIII® check for the same DTC to reset in the MHSAPM.
Did the same DTC reset?
  1. Yes: Go To 2
  2. No: Using the wiring schematic as a guide, inspect the wiring and connectors for an intermittent condition. Check for an intermittent open cushion or seat back element by applying pressure to seat with the heater on and watch the DRBIII for the DTC to reset.

    Perform BODY VERIFICATION TEST VER-1 .

 All
2 Turn ignition off.
Disconnect the MHSAPM C1 connector.
Measure the total resistance of the Passenger Seat Heater Circuit by connecting one lead of the ohmmeter to the Passenger Seat Heater B(+) Driver circuit and the Passenger Seat Heater Ground circuit at the MHSAPM C1 connector.
Is the resistance below 4.0 ohms?
  1. Yes: Replace the Memory Heated Seat Adjustable Pedal Module.

    Perform BODY VERIFICATION TEST VER-1 .

  2. No: Go To 3
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3 Turn ignition off.
Disconnect the Passenger Heated Seat Cushion 4-way connector.
Disconnect the Memory Heated Seat Adjustable Pedal Module C1 connector.
Measure the resistance of the Passenger Seat Heater B(+) Driver circuit between the MHSAPM C1 connector and the Passenger Heated Seat Cushion 4-way connector, harness side.
Is the resistance below 1.5 ohms?
  1. Yes: Go To 4
  2. No: Repair the open Passenger Seat Heater B(+) Driver wire.

    Perform BODY VERIFICATION TEST VER-1 .

 All
4 Reconnect the Passenger Heated Seat Cushion 4-way connector if disconnected.
Disconnect the MHSAPM C1 connector.
Disconnect the Passenger Heated Seat Back 2-way connector.
Measure the resistance of the Passenger Seat Heater Ground circuit from the MHSAPM C1 connector to the Passenger Heated Seat Back 2-way connector (harness side).
Is the resistance below 1.0 ohms?
  1. Yes: Go To 5
  2. No: Repair the Passenger Seat Heater Ground circuit for an open.

    Perform BODY VERIFICATION TEST VER-1 .

 All
5 Disconnect the Passenger Heated Seat Cushion 4-way connector.
Disconnect the Passenger Heated Seat Back 2-way connector.
Measure the resistance of the SEAT CUSHION HEATER ELEMENT by connecting one lead to the Heated Seat Driver terminal at the 2-way and the other lead to the Passenger Seat Heater B(+) Driver terminal in the Heated Seat Cushion 4-way Cushion Side connector.
Is the resistance below 2.5 ohms?
  1. Yes: Go To 6
  2. No: Replace the Passenger Heated Seat Cushion/Element as necessary.

    Perform BODY VERIFICATION TEST VER-1 .

 All
6 Disconnect the Passenger Heated Seat Back 2-way connector.
Measure the resistance of the SEAT BACK HEATER ELEMENT by connecting one lead to the Heated Seat Driver terminal and the other to the Passenger Seat Heater Ground terminal in the Heated Seat Back 2-way connector.
Is the resistance below 1.5 ohms?
  1. Yes: Using the wiring schematic as a guide, inspect the wiring and connectors for an intermittent condition. Check for an intermittent open element in either the cushion or seat back by applying pressure to seat with the ohmmeter connected to each element.

    Perform BODY VERIFICATION TEST VER-1 .

  2. No: Replace the Passenger Heated Seat Back/Element as necessary.

    Perform BODY VERIFICATION TEST VER-1 .

 All
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