Chrysler Pacifica. Manual — part 112
Symptom:
PASSENGER SEAT HEAT OUTPUT OPEN - MHSAPM
When Monitored and Set Condition:
PASSENGER SEAT HEAT OUTPUT OPEN - MHSAPM
When Monitored:
Ignition on, during the heated seat operation.
Set Condition:
This condition is set immediately after the Memory Heated Seat Adjust-
able Pedal Module loses the seat heat element output.
POSSIBLE CAUSES
STORED DIAGNOSTIC TROUBLE CODE
PASSENGER SEAT HEATER B(+) DRIVER WIRE OPEN
PASSENGER SEAT HEATER GROUND CIRCUIT OPEN
PASSENGER HEATED SEAT CUSHION ELEMENT OPEN
PASSENGER HEATED SEAT BACK ELEMENT OPEN
MEMORY HEATED SEAT ADJUSTABLE PEDAL MODULE
TEST
ACTION
APPLICABILITY
1
With the DRBIII
t, 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 DRBIIl
t check for the same DTC to reset in the MHSAPM.
Did the same DTC reset?
All
Yes
→ Go To 2
No
→ Using the wiring schematic as a guide, inspect the wiring and
connectors for an intermittent condition. Check for an intermit-
tent 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.
2
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?
All
Yes
→ Go To 3
No
→ Repair the open Passenger Seat Heater B(+) Driver wire.
Perform BODY VERIFICATION TEST - VER 1.
445
ELECTRICALLY HEATED SYSTEMS
TEST
ACTION
APPLICABILITY
3
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?
All
Yes
→ Go To 4
No
→ Repair the Passenger Seat Heater Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
4
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 Passenger Seat Heater B(+) Driver terminal and the other lead to the
Passenger Seat Heater Ground in the Heated Seat Cushion 4-way connector (seat
side).
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 5
No
→ Repair the pigtail wiring or replace the Passenger Heated Seat
Cushion/Element as necessary.
Perform BODY VERIFICATION TEST - VER 1.
5
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 5.6 ohms?
All
Yes
→ Replace the Memory Heated Seat Adjustable Pedal Module.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the pigtail wiring or replace the Passenger Heated Seat
Back/Element as necessary.
Perform BODY VERIFICATION TEST - VER 1.
446
ELECTRICALLY HEATED SYSTEMS
PASSENGER SEAT HEAT OUTPUT OPEN - MHSAPM —
Continued
Symptom:
PASSENGER SEAT HEAT OUTPUT SHORT TO GROUND - MHSAPM
When Monitored and Set Condition:
PASSENGER SEAT HEAT OUTPUT SHORT TO GROUND - MHSAPM
When Monitored:
Ignition on, during the heated seat operation.
Set Condition:
This code is set immediately after the Memory Heated Seat Adjustable
Pedal Module detects an output shorted to ground.
POSSIBLE CAUSES
STORED DIAGNOSTIC TROUBLE CODE
HEATED SEAT ELEMENT PIGTAIL SHORTED TO GROUND
HEATED SEAT B(+) DRIVER CIRCUIT SHORTED TO HEATER GROUND CIRCUIT
PASSENGER SEAT BACK HEATER SHORT GROUND
PASSENGER HEATED SEAT CUSHION SHORT TO GROUND
PASSENGER SEAT HEATER B(+) DRIVER WIRE SHORT TO GROUND
PASSENGER SEAT HEATER B(+) DRIVER WIRE SHORT TO GROUND FROM MHSAPM TO
4-WAY
MEMORY HEATED SEAT ADJUSTABLE PEDAL MODULE
TEST
ACTION
APPLICABILITY
1
With the DRBIII
t, 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 DRBIIl
t check for the same DTC to reset in the MHSAPM.
Did the same DTC reset?
All
Yes
→ Go To 2
No
→ Using the wiring diagram/schematic as a guide, inspect the
wiring and connectors for an intermittent condition.
Perform BODY VERIFICATION TEST - VER 1.
2
Disconnect the Passenger Heated Seat Cushion 4-way connector.
With the DRBIII
t, erase DTC’s.
Turn the Passenger Seat Heater on.
Using the DRBIII re-read DTC’s
Does the DRBIII
t show the same code?
All
Yes
→ Go To 3
No
→ Go To 5
447
ELECTRICALLY HEATED SYSTEMS
TEST
ACTION
APPLICABILITY
3
Turn ignition off.
Disconnect the Passenger Heated Seat Cushion 4-way connector.
Disconnect the MHSAPM C1 connector.
Measure the resistance of the Passenger Seat Heater B(+) Driver circuit to the
Passenger Seat Heater Ground circuit.
Is the resistance below 1000.0 ohms?
All
Yes
→ Repair the Passenger Seat Heater B(+) Driver wire for a short to
the Passenger Seat Heater Ground circuit.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
4
Turn ignition off.
Disconnect the Passenger Heated Seat Cushion 4-way connector.
Disconnect the MHSAPM C1 connector.
Measure the resistance of the Passenger Seat Heater B(+) Driver circuit to ground.
Is the resistance below 1000.0 ohms?
All
Yes
→ Repair the Passenger Seat Heater B(+) Driver wire for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Memory Heated Seat Adjustable Pedal Module
Perform BODY VERIFICATION TEST - VER 1.
5
Disconnect the Passenger Heated Seat Cushion 4-way connector.
Measure the resistance of the Passenger Seat Heater B(+) Driver circuit in the
Passenger Heated Seat Cushion 4-way connector cushion side to body ground.
Is the resistance below 4.0 ohms?
All
Yes
→ Repair the pigtail wiring for a short to the seat frame or replace
the Passenger Heated Seat Cushion/Element as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 6
6
Disconnect the Passenger Heated Seat Back 2-way connector.
Measure the resistance of the Passenger Heated Seat Driver to the Passenger Seat
Heater Ground, in the Passenger Heated Seat Back 2-way connector seat back side.
Is the resistance below 4.0 ohms?
All
Yes
→ Replace the Passenger Heated Seat Back/Element as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 7
7
Disconnect the Passenger Heated Seat Back 2-way connector if disconnected.
Disconnect the Passenger Heated Seat Cushion 4-way connector.
Measure the resistance of the Passenger Seat Heater B(+) Driver circuit to the
Passenger Seat Heater Ground circuit at the Passenger Heated Seat Cushion 4-way
connector.
Is the resistance below 3.5 ohms?
All
Yes
→ Repair the Passenger Seat Heater B(+) Driver circuit for a short
to the Passenger Seat Heater Ground circuit or replace the
Passenger Heated Seat Cushion/Element as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Inspect the heated seat wiring for a short that may have been
removed during testing and repair as necessary.
Perform BODY VERIFICATION TEST - VER 1.
448
ELECTRICALLY HEATED SYSTEMS
PASSENGER SEAT HEAT OUTPUT SHORT TO GROUND - MHSAPM —
Continued
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