DTC B1AD3

Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category DTC Descriptors DTC B1AD3 Co-Driver Seat Belt Sensor Signal Circuit Diagnostic Fault Information

Circuit	Short to Ground	Open Circuit	Short to Voltage	Signal Performanc
Passenger Seat Belt Switch Signal	B1AD3 11	B1AD3 13	B1AD3 12	—
Passenger Seat Belt Buckle Low Reference	—	B1AD3 13	—	—
Passenger Seat Belt Indicator Control	B1AD3 11	B1AD3 13	B1AD3 12	—
Ground	—	B1AD3 13	—	—

Circuit/System Description For an overview of the component/system, refer to: Supplemental Inflatable Restraint System Description and Operation

Circuit	Description
Control	The output is PWM controlled.
Low Reference	Grounded through the control module.

	Component	Description
	P16 Instrument Panel Cluster Control Module	The control module will illuminate both the driver and passenger airbag and seat belt indicators when triggered by the passenger presence module.
	K36 Restraints Control Module	The control module monitors several sensors that can detect a collision. When a collision is detected, the control module will trigger certain airbags and seat belt pretensioners, depending on the angle and severity of the impact.

Conditions for Running the DTC Ignition voltage is between 9–16 V. Conditions for Setting the DTC B1AD3 12 The passenger seat belt indicator circuit is shorted to voltage. B1AD3 11 The passenger seat belt indicator circuit is shorted to ground. B1AD3 13 The passenger seat belt indicator circuit is open. Action Taken When the DTC Sets The Restraints Control Module will store the DTC and illuminate the Airbag indicator on the P16  Instrument Panel Cluster Control Module. Conditions for Clearing the DTC The condition for setting the DTC no longer exists. Reference Information Schematic Reference SIR Schematics Connector End View Reference Master Electrical Component List Description and Operation Supplemental Inflatable Restraint System Description and Operation Electrical Information Reference Circuit Testing Testing for Intermittent Conditions and Poor Connections Wiring Repairs Connector Repairs Scan Tool Reference Control Module References for scan tool information Circuit/System Verification

Note

The condition may be intermittent and require driving the vehicle, then reviewing the snapshot to verify resistance parameters do not drop out or spike. Refer to Testing for Intermittent Conditions and Poor Connections

1. Ignition ON.
2. Verify DTC B1AD3 is not set as current. ⇒ If DTC B1AD3 is set as current. Refer to Circuit/System Testing ⇓ If DTC B1AD3 is not set as current.
3. A fault is not currently present and may be an intermittent condition. Circuit/System Testing

Note

Refer to SIR Service Precautions. Refer to SIR Disabling and Enabling. Inspect all terminals for damage or corrosion when disconnecting connectors. Damage or corrosion in the following requires repair or replacement of the affected component/connector. B153P Front Seat Belt Buckle - Passenger K36 Inflatable Restraint Sensing and Diagnostic Module The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click.

1. Ignition OFF, disconnect the harness connector at the appropriate B153 Seat Belt Buckle. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 5 Ω between the low reference circuit terminal 1 and ground. ⇒ If 5 Ω or greater 2.1. Ignition OFF. 2.2. Verify the SIR system is disabled. 2.3. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module. 2.4. Test for less than 2 Ω in the low reference circuit end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ If less than 2 Ω, replace the K36 Inflatable Restraint Sensing and Diagnostic Module. ⇓ If less than 5 Ω
3. Ignition ON.
4. Verify the appropriate scan tool Seat Belt Status parameter is Buckled. ⇒ If not Buckled 4.1. Ignition OFF. 4.2. Verify the SIR system is disabled. 4.3. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module. 4.4. Test for infinite resistance between the signal circuit terminal 2 and ground. ⇒ If less than infinite resistance, repair the short to ground on the circuit. ⇒ If infinite resistance, replace the K36 Inflatable Restraint Sensing and Diagnostic Module. ⇓ If Buckled
5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1.
6. Verify the appropriate scan tool Seat Belt Status parameter is Unbuckled. ⇒ If not Unbuckled 6.1. Ignition OFF. 6.2. Verify the SIR system is disabled. 6.3. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module, ignition ON. 6.4. Test for less than 1 V between the signal circuit and ground. ⇒ If 1  V or greater, repair the short to voltage on the circuit. ⇓ If less than 1 V 6.5. Test for less than 2 Ω in the signal circuit end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ If less than 2 Ω, replace the K36 Inflatable Restraint Sensing and Diagnostic Module. ⇓ If Unbuckled
7. Test or replace the B153P Front Seat Belt buckle - Passenger. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Front Seat Belt Buckle Replacement Control Module References for Restraints Control Module replacement, programming, and setup