Jeep Grand Cherokee WK. Manual — part 584

B1B2F-1st ROW PASSENGER SEAT BELT PRETENSIONER CIRCUIT SHORTED TOGETHER (CONTINUED)

5.

STORED ORC DTC

With the scan tool, record and erase all DTC’s from all Airbag System 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.

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 active DTC in question.

Are any ACTIVE DTC’s present?

Yes

>> Select the appropriate diagnostic procedure from the Table of Contents in this section.

No

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

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RESTRAINTS - ELECTRICAL DIAGNOSTICS

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B1B70-UP-FRONT LEFT SATELLITE ACCELERATION SENSOR INTERNAL

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RESTRAINTS - ELECTRICAL DIAGNOSTICS

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B1B70-UP-FRONT LEFT SATELLITE ACCELERATION SENSOR INTERNAL (CONTINUED)

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

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
The Occupant Restraint Controller (ORC) continuously communicates with the Front Left Impact Sensor over
the sensor signal circuit. The sensor communication and on board diagnostics are powered by the ORC signal.

•

Set Condition:
This code will set, if the ORC and the Front Left Impact Sensor do not establish and maintain valid data com-
munications.

Possible Causes

(R79) SIGNAL CIRCUIT SHORTED TO BATTERY

(R79) SIGNAL CIRCUIT SHORTED TO GROUND

(R79, R81) FRONT LEFT IMPACT SENSOR CIRCUITS SHORTED TOGETHER

(R81) FRONT LEFT IMPACT SENSOR GROUND CIRCUIT OPEN

(R79) FRONT LEFT IMPACT SENSOR SIGNAL CIRCUIT OPEN

ORC, FRONT LEFT IMPACT SENSOR

Diagnostic Test

1.

VERIFY THAT DTC B1B70-UP-FRONT LEFT SATELLITE ACCELERATION SENSOR INTERNAL IS ACTIVE

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.

With the scan tool, read ORC DTCs.

Does the scan tool display active: B1B70-UP-FRONT LEFT SATELLITE ACCELERATION SENSOR INTER-
NAL?

Yes

>> Go To 2

No

>> Go To 9

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RESTRAINTS - ELECTRICAL DIAGNOSTICS

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B1B70-UP-FRONT LEFT SATELLITE ACCELERATION SENSOR INTERNAL (CONTINUED)

2.

CHECK THE (R79, R81) FRONT LEFT IMPACT SENSOR SIGNAL AND GROUND CIRCUITS FOR A SHORT
TO BATTERY

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

Disconnect the ORC connector.

WARNING: To avoid personal injury or death, turn the ignition on,
then reconnect the battery.
Measure the voltage of the (R79) Front Left Impact Sensor Signal cir-
cuit and (R81) Sensor Ground circuit at the Front Left Impact Sensor
connector and ground.

Is there any voltage present?

Yes

>> Repair the (R79, R81) Front Left Impact Sensor circuits for

a short to battery.

Perform the ORC VERIFICATION TEST - VER 1.

No

>> Go To 3

3.

CHECK THE (R79) FRONT LEFT IMPACT SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

WARNING: To avoid personal injury or death, turn the ignition off,
disconnect the battery and wait two minutes before proceeding.
Measure the resistance of the (R79) Front Left Impact Sensor Signal
circuit between the Front Left Impact Sensor connector and ground.

Is the resistance below 100K ohms?

Yes

>> Repair the (R79) Front Left Impact Sensor Signal circuit

for a short to ground.

Perform the ORC VERIFICATION TEST - VER 1.

No

>> Go To 4

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RESTRAINTS - ELECTRICAL DIAGNOSTICS

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