Jeep Grand Cherokee WK. Manual — part 517
B1D71–SEAT FRONT VERTICAL POSITION SENSOR CIRCUIT LOW (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:
When the seat motor is activated (sensor supply voltage is switched on whenever motor is activated).
•
Set Condition:
If sensor voltage is not within a specified range this DTC will set. This DTC will only set when the seat switch
is moved in the same direction three consecutive times.
Possible Causes
(G404) DRIVER SEAT FRONT VERTICAL POSITION SENSE CIRCUIT SHORTED TO GROUND
FRONT DRIVER VERTICAL SEAT ADJUSTER MOTOR
MEMORY SEAT MODULE
Diagnostic Test
1.
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 B1D71–SEAT FRONT VERTICAL POSITION SENSOR CIRCUIT LOW?
Yes
>> Go To 2
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. (Refer to 8 - ELECTRICAL/POWER
SEATS - DIAGNOSIS AND TESTING)
8N - 228
POWER SEATS - ELECTRICAL DIAGNOSTICS
WK
B1D71–SEAT FRONT VERTICAL POSITION SENSOR CIRCUIT LOW (CONTINUED)
2.
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 the Driver
Seat Front Vertical Sensor Ground at the Front Driver Seat Adjuster
Motor connector.
Does the test light illuminate for approximately 2 seconds then
turn off with the seat switch engaged?
Yes
>> Replace the Front Driver Seat Adjuster Motor assembly.
Perform POWER SEAT SYSTEM VERIFICATION TEST –
VER 1 (Refer to 8 - ELECTRICAL/POWER SEATS -
DIAGNOSIS AND TESTING)
No
>> Go To 3
3.
CHECK THE (G404) DRIVER SEAT FRONT VERTICAL POSITION SENSE WIRE FOR A SHORT TO
GROUND
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 wire at the Front Driver Vertical Seat Adjuster Motor con-
nector to ground.
Is the resistance below 1000.0 ohm?
Yes
>> Repair the (G404) Driver Seat Front Vertical Position
Sense circuit for a short to ground.
Perform POWER SEAT SYSTEM VERIFICATION TEST –
VER 1 (Refer to 8 - ELECTRICAL/POWER SEATS -
DIAGNOSIS AND TESTING)
No
>> Replace the Memory Seat Module.
Perform POWER SEAT SYSTEM VERIFICATION TEST –
VER 1 (Refer to 8 - ELECTRICAL/POWER SEATS -
DIAGNOSIS AND TESTING)
WK
POWER SEATS - ELECTRICAL DIAGNOSTICS
8N - 229
B1D72–SEAT FRONT VERTICAL POSITION SENSOR CIRCUIT HIGH
8N - 230
POWER SEATS - ELECTRICAL DIAGNOSTICS
WK
B1D72–SEAT FRONT VERTICAL POSITION SENSOR CIRCUIT HIGH (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:
When the seat motor is activated (sensor supply voltage is switched on whenever motor is activated).
•
Set Condition:
If during motor operation the sensor voltage is not within a specified range this code will set. This DTC will
only set when the seat switch is moved in the same direction three consecutive times.
Possible Causes
(G404) DRIVER SEAT FRONT VERTICAL POSITION SENSE CIRCUIT SHORTED TO VOLTAGE
REAR DRIVER VERTICAL SEAT ADJUSTER MOTOR
MEMORY SEAT MODULE
Diagnostic Test
1.
TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
With the scan tool, record and erase DTC’s
Move the seat switch front vertical position 3 times.
With the scan tool, read DTC’s.
Does the scan tool display B1D72–SEAT FRONT VERTICAL POSITION SENSOR CIRCUIT HIGH?
Yes
>> Go To 2
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. (Refer to 8 - ELECTRICAL/POWER
SEATS - DIAGNOSIS AND TESTING)
2.
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.
With the scan tool erase DTC’s
Move the seat switch in the both front vertical positions 3 times.
With the scan tool, read DTC’s.
Does the same DTC reset?
No
>> Inspect the position sense wire for a possible intermittent short to another circuit, if OK replace the Front
Driver Vertical Seat Adjuster Motor assembly.
Perform POWER SEAT SYSTEM VERIFICATION TEST – VER 1 (Refer to 8 - ELECTRICAL/POWER
SEATS - DIAGNOSIS AND TESTING)
Yes
>> Inspect the position sense wire for a possible short to another circuit, if OK replace the Memory Seat
Module.
Perform POWER SEAT SYSTEM VERIFICATION TEST – VER 1 (Refer to 8 - ELECTRICAL/POWER
SEATS - DIAGNOSIS AND TESTING)
WK
POWER SEATS - ELECTRICAL DIAGNOSTICS
8N - 231
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