Jeep Grand Cherokee WK. Manual - part 604

B1B84-PASSENGER SEAT WEIGHT SENSOR 4 - LEFT REAR INPUT CIRCUIT HIGH (CONTINUED)

CHECK (R705) LT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

WARNING: To avoid personal injury or death, turn the ignition off,
disconnect the battery and wait two minutes before proceeding.
Disconnect the OCM C2 connector.

Measure the voltage of the (R705) LT-RR Seat Weight Sensor Signal
circuit.

Is the voltage above 0.2 volts?

Yes

NOTE: Do not attempt to repair the Seat Harness. Replace the
Seat Harness if the condition inspecting or testing for is present
in the Seat Harness.

Replace the Passenger Seat Harness in accordance with
the Service Information.

Perform OCS VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/RESTRAINTS - DIAGNOSIS
AND TESTING)

>> Go To 7

CHECK (R705) LT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO (R701) SEAT WEIGHT
SENSOR 5 VOLT CIRCUIT

Disconnect the Left-Rear Seat Weight Sensor connector.

Measure the resistance between the (R705) LT-RR Seat Weight Sen-
sor Signal circuit and the (R701) Seat Weight Sensor 5 Volt circuit.

Is the resistance below 10K ohms?

Yes

NOTE: Do not attempt to repair the Seat Harness. Replace the
Seat Harness if the condition inspecting or testing for is present
in the Seat Harness.

Replace the Passenger Seat Harness in accordance with
the Service Information.

Perform OCS VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/RESTRAINTS - DIAGNOSIS AND TEST-
ING)

>> Go To 8

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RESTRAINTS - ELECTRICAL DIAGNOSTICS

B1B84-PASSENGER SEAT WEIGHT SENSOR 4 - LEFT REAR INPUT CIRCUIT HIGH (CONTINUED)

CHECK (R728) SEAT WEIGHT SENSOR GROUND CIRCUIT FOR AN OPEN

Measure the resistance of the (R728) Seat Weight Sensor Ground cir-
cuit between the OCM C2 connector and the Left-Rear Seat Weight
Sensor connector.

Is the resistance below 5.0 ohms?

Yes

>> Replace the OCM in accordance with the Service Informa-

tion.

Perform OCS VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/RESTRAINTS - DIAGNOSIS AND TEST-
ING)

NOTE: Do not attempt to repair the Seat Harness. Replace the
Seat Harness if the condition inspecting or testing for is present
in the Seat Harness.

Replace the Passenger Seat Harness in accordance with
the Service Information.

Perform OCS VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/RESTRAINTS - DIAGNOSIS AND TEST-
ING)

TEST FOR INTERMITTENT CONDITION

With the scan tool, record and erase all DTCs from all Airbag modules.

If any ACTIVE codes are present they must be resolved before diagnosing any stored codes.

WARNING: To avoid personal injury or death, turn the ignition off, disconnect the battery and wait two min-
utes before proceeding.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.

Look for chaffed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or
contaminated terminals.

The following additional checks may assist you in identifying a possible intermittent problem.

Reconnect any disconnected components and harness connector.

WARNING: To avoid personal injury or death, turn the ignition on, then reconnect the battery.
With the scan tool, monitor active codes as you work through the following steps.

WARNING: To avoid personal injury or death, maintain a safe distance from all airbags while performing the
following steps.
Wiggle the wiring harness and connectors of the related airbag circuit or component.

If codes are related to the Driver Airbag circuits, rotate the steering wheel from stop to stop.

If only stored codes return, continue the test until the problem area has been isolated.

In the previous steps you have attempted to recreate the conditions responsible for setting the active DTC in ques-
tion.

Does the scan tool display any ACTIVE DTCs?

Yes

>> Select appropriate symptom from Symptom List.

>> No problem found at this time. Erase all codes before returning vehicle to customer.

RESTRAINTS - ELECTRICAL DIAGNOSTICS

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B1B87-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR PERFORMANCE

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RESTRAINTS - ELECTRICAL DIAGNOSTICS

B1B87-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR PERFORMANCE (CONTINUED)

For the Occupant Classification System circuit diagram (Refer to 8 - ELECTRICAL/RESTRAINTS - SCHEMATICS
AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
When CAN ignitions status is Run or SNA, during auto zero and while performing the Occupant Classification
Module System Verification Test.

•

Set Condition:
During the occupant classification verification test: if the module detects that the sensor input is less than 1.4
volts or greater than 3.6 volts. During auto zero: if the module detects that the sensor input is less than 1 volt
or greater than 4 volts.

Possible Causes

PASSENGER SEAT HARNESS WIRES CHAFFED, PIERCED, PINCHED, PARTIALLY BROKEN

PASSENGER SEAT HARNESS CONNECTOR TERMINALS BROKEN, BENT PUSHED OUT, SPREAD,
CORRODED, CONTAMINATED

RIGHT-REAR PASSENGER SEAT WEIGHT SENSOR

DAMAGE TO THE PASSENGER SEAT STRUCTURE, RISER ASSEMBLY, CROSSMEMBERS, SEAT TRACKS,
FLOOR PAN

OCCUPANT CLASSIFICATION MODULE (OCM)

Diagnostic Test

CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS, & BATTERY FAULTS IN THE OCCUPANT
CLASSIFICATION MODULE (OCM)

NOTE: Ensure the battery is fully charged.

NOTE: When reconnecting Airbag system components, the ignition must be turned off and the battery must
be disconnected.
Turn the ignition on, then off, and then on again.

With the scan tool, read Occupant Classification Module (OCM) DTCs.

Does the scan tool display any active DTCs relating to internal faults, ignition faults, or battery faults?

Yes

>> Diagnose and repair the DTCs. Refer to the Table of Contents in this Section for a complete list of

symptoms.

>> Go To 2

VERIFY THAT DTC B1B87–PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR PERFORMANCE IS
ACTIVE

With the scan tool, read OCM DTCs.

Does the scan tool display active: B1B87–PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR PER-
FORMANCE?

Yes

>> Go To 3

>> Go To 5

RESTRAINTS - ELECTRICAL DIAGNOSTICS

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