Jeep Grand Cherokee WK. Manual - part 578

B1B23-RIGHT SIDE CURTAIN SQUIB 1 CIRCUIT SHORTED TOGETHER (CONTINUED)

REPLACE THE ORC

WARNING: If the Occupant Restraint Controller (ORC) is dropped at any time, it must be replaced. Failure to
take the proper precautions can result in accidental airbag deployment and personal injury or death.

NOTE: When reconnecting airbag system components the Ignition must be turned off and the Battery must
be disconnected.

Repair

Replace the ORC in accordance with the Service Information.

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

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 problem found at this time. Erase all codes before returning vehicle to customer.

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RESTRAINTS - ELECTRICAL DIAGNOSTICS

B1B28-1st ROW DRIVER SEAT BELT PRETENSIONER CIRCUIT LOW

For the Air Bag System circuit diagram (Refer to 8 - ELECTRICAL/RESTRAINTS - SCHEMATICS AND DIA-
GRAMS).

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
With the ignition on, the Occupant Restraint Controller (ORC) monitors the resistance of the Driver Seat Belt
Tensioner circuits.

•

Set Condition:
The ORC has detected low resistance on the Driver Seat Belt Tensioner circuits.

Possible Causes

(R55) DRIVER SEAT BELT TENSIONER LINE 1 CIRCUIT OR (R53) DRIVER SEAT BELT TENSIONER LINE 2
CIRCUIT SHORTED TO GROUND

DRIVER SEAT BELT PRETENSIONER

ORC

Diagnostic Test

DETERMINE ACTIVE OR STORED DTC

NOTE: Ensure the battery is fully charged.

NOTE: The scan tool, SRS Airbag Load Tool MRL 8443, and DVOM are required to perform the following
test.

NOTE: When reconnecting airbag system components the Ignition must be turned off and the Battery must
be disconnected.
Select Active or Stored DTC.

Is the DTC active or stored?

ORC - ACTIVE DTC

Go To 2

ORC - STORED DTC

Go To 5

CHECK FOR SHORTED DRIVER SEAT BELT PRETENSIONER

WARNING: To avoid personal injury or death, turn the ignition off, disconnect the battery and wait two min-
utes before proceeding.
Disconnect the Driver Seat Belt Pretensioner connector.

NOTE: Check connectors - Clean and repair as necessary.
Connect the 8443 Load Tool and appropriate Jumper to the Driver Seat Belt Pretensioner connector.

WARNING: To avoid personal injury or death, turn the ignition on, then reconnect the battery.
With the scan tool, read the active ORC DTC’s.

Does the scan tool display: B1B28 1st ROW DRIVER SEAT BELT PRETENSIONER CIRCUIT LOW?

Yes

>> Go To 3

>> Replace the Driver Seat Belt Pretensioner in accordance with the Service Information.

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

RESTRAINTS - ELECTRICAL DIAGNOSTICS

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B1B28-1st ROW DRIVER SEAT BELT PRETENSIONER CIRCUIT LOW (CONTINUED)

CHECK (R55) DRIVER SEAT BELT TENSIONER LINE 1 CIRCUIT AND (R53) DRIVER SEAT BELT
TENSIONER LINE 2 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.
Disconnect the 8443 Load Tool and Jumper from the Driver Seat Belt
Pretensioner connector.

Disconnect the ORC connectors.

NOTE: Check connectors - Clean and repair as necessary.
Connect the 8443 Load Tool ORC Adaptor to the ORC C1 connector.

Measure the resistance of the (R55) Driver Seat Belt Tensioner Line 1
circuit between ground and the ORC adaptor.

Measure the resistance of the (R53) Driver Seat Belt Tensioner Line 2
circuit between ground and the ORC adaptor.

Is the resistance below 10K ohms on either circuit?

Yes

>> Repair the Driver Seat Belt Tensioner circuit(s) for a short

to ground.

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

>> Go To 4

REPLACE THE ORC

NOTE: When reconnecting airbag system components the Ignition must be turned off and the Battery must
be disconnected.

Repair

Replace the ORC in accordance with the Service Information.

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

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