Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 435
B1094-FRONT LEFT SEAT HEATER CONTROL CIRCUIT OPEN
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HEATED SEATS - ELECTRICAL DIAGNOSTICS
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For a complete wiring diagram Refer to Section 8W.
•
When Monitored:Ignition on, during the heated seat operation.
•
Set Condition:This code is set immediately after the Heated Seat Module detects an open in the seat heater
B(+) driver circuit.
Possible Causes
(P187) LEFT SEAT HEATER B(+) DRIVER WIRE OPEN
(Z912) GROUND WIRE OPEN
SEAT CUSHION HEATER ELEMENT OPEN
SEAT BACK HEATER ELEMENT OPEN
HEATED SEAT MODULE
Diagnostic Test
1.
VERIFY THAT DTC B1094-FRONT LEFT SEAT HEATER CONTROL CIRCUIT OPEN IS ACTIVE
With the scan tool, record and erase DTC’s
Operate the Heated Seat Switch in both positions several times.
With the scan tool, read DTC’s.
Does the DTC B1094 FRONT LEFT SEAT HEATER CONTROL
CIRCUIT OPEN reset?
Yes
>> Go To 2
No
>> The conditions that caused this code to set are not present
at this time. Using the wiring diagram/schematic as a guide,
inspect the wiring and connectors.
Perform BODY VERIFICATION TEST – VER 1. (Refer to
BODY VERIFICATION TEST – VER 1).
2.
CHECK FOR AN OPEN SEAT HEATER ELEMENT
Disconnect the Left Seat Cushion Heater 2 – way connector.
NOTE: Check connectors - Clean and repair as necessary.
Measure the total resistance of the cushion and seat back heater ele-
ments at the Left Seat Cushion 2 – way connector (seat side).
Is the total resistance 2.5 ohms + or – .5 ohms?
Yes
>> Go To 4
No
>> Go To 3
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HEATED SEATS - ELECTRICAL DIAGNOSTICS
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3.
CHECK THE LEFT SEAT BACK HEATER RESISTANCE
Disconnect the Left Seat Back Heater 2 – way connector.
NOTE: Check connectors - Clean and repair as necessary.
Check the resistance of the seat back heater element by measuring
between the (P187) Left Seat Heater B(+) Driver and the Ground circuit
at the connector.
Is the resistance above 5.8 ohms?
Yes
>> Repair the open pigtail harness or replace the seat back
heater element as necessary.
Perform BODY VERIFICATION TEST – VER 1. (Refer to
BODY VERIFICATION TEST – VER 1).
No
>> Repair the open pigtail harness or replace the seat cushion
heater element as necessary.
Perform BODY VERIFICATION TEST – VER 1. (Refer to
BODY VERIFICATION TEST – VER 1).
4.
CHECK THE LEFT SEAT HEATER GROUND CIRCUIT RESISTANCE
Measure the resistance of the Ground circuit at the Left Seat Heater
Cushion 2 – way connector.
Was the resistance below 5.0 ohms?
Yes
>> Go To 5
No
>> Repair the open ground circuit.
Perform BODY VERIFICATION TEST – VER 1. (Refer to
BODY VERIFICATION TEST – VER 1).
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5.
Check the (P187) Left Seat Heater B(+) Driver circuit for an open.
Disconnect the Heated Seat Module connector.
NOTE: Check connectors - Clean and repair as necessary.
Measure the (P187) Left Seat Heater B(+) Driver circuit from the Left
Seat Cushion Heater 2–way connector (harness side) to the HSM con-
nector.
Is the resistance below 5.0 ohms?
Yes
>> Replace the Heated Seat Module.
Perform BODY VERIFICATION TEST – VER 1. (Refer to
BODY VERIFICATION TEST – VER 1).
No
>> Repair the (P187) Left Seat Heater B(+) Driver circuit for an
open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to
BODY VERIFICATION TEST – VER 1).
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HEATED SEATS - ELECTRICAL DIAGNOSTICS
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