Diagnostic Fault Information
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
DTC Descriptors
DTC B0595 01: Fasten Seatbelt Indicator Circuit Short to BatteryDTC B0595 06: Fasten Seatbelt Indicator Circuit Short to Ground or Open
Diagnostic Fault Information
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
Driver Seat Belt Sensor Signal | B0595 06, 1 | B0595 06, 2 | B0595 06, 2 | B0595 01, 2 | B0595 01, B0595 06 |
Driver Seat Belt Sensor Low Reference | -- | B0595 06, 2 | B0595 06, 2 | 2 | B0595 01, B0595 06 |
1. Indicator will remain ON with seat belt buckled. 2. Indicator will illuminate only for the bulb test. | |||||
Circuit/System Description
The inflatable restraint sensing and diagnostic module (SDM) sends the status of the driver seat belt switch to the instrument panel cluster (IPC) via a serial data message. If the seat belt is unfastened, the SDM will send a message to the IPC to illuminate the fasten safety belt indicator for 72 seconds or until the seat belt is fastened.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
B0595 01
The SDM detects the seat belt sensor circuit is shorted to voltage for 2 seconds.
B0595 06
The SDM detects the seat belt sensor circuit is shorted to ground or open for 2 seconds.
Action Taken When the DTC Sets
| • | The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator. |
| • | The SDM will store the DTC. |
Conditions for Clearing the DTC
| • | The condition for setting the DTC no longer exists. |
| • | A history DTC will clear once 100 fault-free ignition cycles have occurred. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Seat Belt System Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Ignition ON, perform the IPC Lamp and Gauge Test using the scan tool and verify the driver seat belt indicator is illuminated.
| ⇒ | If the indicator does not illuminate, replace the IPC. |
Circuit/System Testing
Important: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
• The BCM • The left seat belt switch • The SDM • The left seat belt switch harness connector • The SDM wiring harness connector
- Ignition OFF, disconnect the harness connector at the driver seat belt switch.
- Ignition OFF, test for less than 1.0 ohm of resistance between the low reference circuit terminal C and ground.
- Ignition ON, verify the scan tool driver seat belt switch parameter is Unbuckled.
- Install a 3-amp fused jumper wire between the signal circuit terminal A and the low reference circuit terminal C. Verify the scan tool driver seat belt switch parameter is Buckled.
- If all circuits test normal, replace the driver seat belt switch.
| ⇒ | If greater than the specified value, test the low reference circuit for an open/high resistance. |
| ⇒ | If not the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the SDM. |
| ⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the SDM. |
Component Testing
- Ignition OFF, disconnect the harness connector at the driver seat belt switch.
- Test for infinite resistance between the signal circuit terminal A and the low reference circuit terminal C.
- With the seat belt buckled, test for less than 2 ohms of resistance between the signal circuit terminal A and the Low reference circuit terminal C.
| ⇒ | If not the specified value, replace the left seat belt switch. |
| ⇒ | If greater than the specified range, replace the driver seat belt switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for SDM and IPC replacement, setup, and programming |
