Jeep Grand Cherokee WK. Manual — part 522
B1D7F–SEAT FRONT VERTICAL MOTOR CONTROL CIRCUIT PERFORMANCE
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POWER SEATS - ELECTRICAL DIAGNOSTICS
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B1D7F–SEAT FRONT VERTICAL MOTOR CONTROL CIRCUIT PERFORMANCE (CONTINUED)
For the Power Seat System circuit diagram (Refer to 8 - ELECTRICAL/POWER SEATS - SCHEMATICS AND DIA-
GRAMS)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Whenever the seat motor is activated.
•
Set Condition:
If the Memory Seat Module does not detect the rotation of the seat motor this DTC will set. This DTC will only
set when the seat switch is moved in the same direction three consecutive times.
Possible Causes
SEAT POSITION SENSOR CIRCUIT DIAGNOSTIC TROUBLE CODES
(G404) DRIVER SEAT FRONT VERTICAL POSITION SENSE CIRCUIT OPEN
(G494) DRIVER SEAT FRONT VERTICAL SENSOR GROUND CIRCUIT OPEN
(P119) DRIVER SEAT FRONT VERTICAL UP DRIVER
(P121) DRIVER SEAT FRONT VERTICAL DOWN DRIVER
FRONT DRIVER VERTICAL SEAT ADJUSTER MOTOR
MEMORY SEAT MODULE
Diagnostic Test
1.
CHECK FOR RELATED DIAGNOSTIC TROUBLE CODES
Turn the ignition on.
With the scan tool, read DTC’s.
Does the scan tool display any seat position sensor DTC’s?
Yes
>> Diagnose and repair other DTC(s) first. Refer to the Table of Contents in this Section for a complete list
of symptoms.
No
>> Go To 2
2.
TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
With the scan tool, record and erase DTC’s
Move the Seat Switch in the Front Vertical position 3 times.
With the scan tool, read DTC’s.
Does the scan tool display B1D7F–SEAT FRONT VERTICAL MOTOR CONTROL CIRCUIT PERFORMANCE?
Yes
>> Go To 3
No
>> The conditions that caused this code to set are not present at this time. Using the wiring diagram/sche-
matic as a guide, inspect the wiring and connectors.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER 1.
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POWER SEATS - ELECTRICAL DIAGNOSTICS
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B1D7F–SEAT FRONT VERTICAL MOTOR CONTROL CIRCUIT PERFORMANCE (CONTINUED)
3.
CHECK THE (G404) DRIVER SEAT FRONT VERTICAL POSITION SENSE VOLTAGE
Disconnect the Front Driver Vertical Seat Adjuster Motor.
NOTE: Check connectors – Clean and repair as necessary.
Move the Seat Switch in the front vertical position during the next step.
Using a 12-volt test light connect one lead to the (G404) Driver Seat
Front Vertical Position Sense circuit and the other lead to Driver Seat
Front Vertical Sensor Ground at the Driver Front Vertical Seat Adjuster
Motor connector.
Does the test light illuminate for approximately 2 seconds then
turn off with the seat switch engaged?
Yes
>> Go To 4
No
>> Go To 5
4.
CHECK THE DRIVER SEAT FRONT VERTICAL UP/DOWN DRIVER VOLTAGE
Move the Seat Switch in the front vertical position during the next step.
Using a 12-volt test light connect one lead to the (G119) Driver Seat
Front Vertical Up Driver circuit and the other lead to (P121) Driver
Seat Front Vertical Down Driver circuit at the Front Driver Vertical Seat
Adjuster Motor connector.
Does the test light illuminate with the seat switch engaged?
Yes
>> Replace the Front Driver Vertical Seat Adjuster motor
assembly.
Perform POWER SEAT SYSTEM VERIFICATION TEST –
VER 1
No
>> Go To 7
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POWER SEATS - ELECTRICAL DIAGNOSTICS
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B1D7F–SEAT FRONT VERTICAL MOTOR CONTROL CIRCUIT PERFORMANCE (CONTINUED)
5.
CHECK THE (G404) DRIVER SEAT FRONT VERTICAL POSITION SENSE WIRE FOR AN OPEN
Disconnect the Memory Seat Module C3 connector.
NOTE: Check connectors – Clean and repair as necessary.
Measure the resistance of the (G404) Driver Seat Front Vertical Posi-
tion Sense circuit at the Front Driver Vertical Seat Adjuster Motor con-
nector to the C3 connector.
Is the resistance above 1.0 ohm?
Yes
>> Repair the (G404) Driver Seat Front Vertical Position
Sense circuit for an open.
Perform POWER SEAT SYSTEM VERIFICATION TEST –
VER 1
No
>> Go To 6
6.
CHECK THE (G494) DRIVER SEAT FRONT VERTICAL SENSOR GROUND FOR AN OPEN
Measure the resistance of the (G494) Driver Seat Front Vertical Sen-
sor Ground circuit at the Driver Front Vertical Seat Adjuster Motor con-
nector to the C3 connector.
Is the resistance above 1.0 ohm?
Yes
>> Repair the (G494) Driver Seat Front Vertical Senor Ground
circuit for an open.
Perform POWER SEAT SYSTEM VERIFICATION TEST –
VER 1
No
>> Replace the Memory Seat Module.
Perform POWER SEAT SYSTEM VERIFICATION TEST –
VER 1
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POWER SEATS - ELECTRICAL DIAGNOSTICS
8N - 251
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