B059A
DTC B059A
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category
DTC Descriptors
DTC B059A 01
- Passenger Seat Belt Indicator Circuit Short to Battery
DTC B059A 02
- Passenger Seat Belt Indicator Circuit Short to Ground
DTC B059A 04
- Passenger Seat Belt Indicator Circuit Open
Diagnostic Fault Information
Circuit/System Description
The inflatable restraint sensing and diagnostic module (SDM) monitors the passenger seat status and the passenger seat belt buckle switch and provides an output to the passenger seat belt indicator. When the SDM detects the passenger seat is occupied and the seat belt is not fastened, the SDM supplies a pulse width modulated signal to control the passenger seat belt indicator circuit. The SDM monitors the passenger seat belt indicator circuits and if a fault is detected a DTC will be set.
Conditions for Running the DTC
Ignition voltage is between 9-16 V.
Conditions for Setting the DTC
B059A 01
The passenger seat belt indicator circuit is shorted to voltage.
B059A 02
The passenger seat belt indicator circuit is shorted to ground.
B059A 04
The passenger seat belt indicator circuit circuit is open.
Action Taken When the DTC Sets
The inflatable restraint sensing and diagnostic module will store the DTC.
Conditions for Clearing the DTC
The condition for setting the DTC no longer exists.
Reference Information
Schematic Reference
SIR Schematics [1][2]Air Bag Systems
Connector End View Reference
Component Connector End Views Sunshade - Left (DH6)
Description and Operation
SIR System Description and Operation Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
* Connector Repairs Connector Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Testing
Note: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
* P14 passenger air bag disable indicator
* K36 inflatable restraint sensing and diagnostic module
1. Ignition OFF.
2. Disconnect the harness connector at the S48A multifunction switch - instrument panel.
3. Test for less than 10 ohms between the ground circuit terminal 1 and ground.
• If 10 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
4. Connect a test lamp between the control circuit terminal 4 and ground.
5. Ignition ON.
6. Occupy the passenger seat, buckle and unbuckle the passenger seat belt, the test lamp should turn OFF and ON while changing between buckled and unbuckled.
• If the test lamp is always on
1. Ignition OFF, disconnect the harness connector at the K36 inflatable restraint sensing and diagnostic module, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.
• If 1V or greater, repair the short to voltage on the circuit.
• If less than 1V, replace the K36 inflatable restraint sensing and diagnostic module.
• If the test lamp is always off
1. Disconnect the harness connector at the K36 inflatable restraint sensing and diagnostic module.
2. Test for infinite resistance between the seat belt switch signal circuit terminal 45 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in each control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K36 inflatable restraint sensing and diagnostic module.
• If test lamp turns on and off while changing between the commanded states
7. Replace the S48A multifunction switch - instrument panel.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Hazard Warning and Accessory Switch Replacement Service and Repair for multifunction switch - instrument panel replacement
* Control Module References Control Module References for inflatable restraint sensing and diagnostic module replacement, setup, and programming