Volt

DTC B0098

When the ignition switch is turned to ON, the sensing and diagnostic module (SDM) will perform turn-on test to diagnose critical malfunctions within SDM itself. The SDM continuously checks the disable switch position switch and circuit defect by letting the regular voltage flow through the disable switch circuit and verifying the current.

Ignition voltage is between 9-16 V.

B0098 02

The SDM detects a short to ground in the passenger air bag disable switch signal circuit.

B0098 05

The SDM detects a short to voltage or an open/high resistance in the passenger air bag disable switch signal circuit or the passenger air bag disable switch ground circuit.

The SDM will ignore the signal from the passenger air bag disable switch and will continuously enable the passenger air bag.

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Observe the scan tool Passenger Air Bag Disabled Switch parameter while commanding the passenger air bag ON and OFF by using the S40 passenger air bag disable switch. The value should change between On and Off

1. Vehicle OFF.
2. Disconnect the harness connector at the S40 passenger air bag disable switch.
3. Test for less than 30 Ω between the low reference circuit terminal 3 and ground.

⇒	If 30 Ω or greater

3.1.	Ignition OFF, disconnect the X1 harness connector at the K36 SDM.

3.2.	Test for less than 2 Ω in the S40 passenger air bag disable switch ground circuit end to end.

⇒	If 2 Ω or greater, replace the coil or repair the open/high resistance in the circuit.

⇒	If less than 2 Ω, replace the K36 SDM.

⇓	If less than 30 Ω

4. Vehicle in Service Mode, test for 4.75-5.25 V between the signal circuit terminal 1 and ground.

⇒	If less than 4.75 V

4.1.	Disconnect the X1 harness connector at the K36 SDM.

4.2.	Test for infinite resistance between the signal circuit and ground.

⇒	If less than infinite resistance, repair the short to ground on the circuit.

4.3.	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 SDM.

⇒	If greater than 5.25 V

4.1.	Vehicle OFF.

4.2.	Disconnect the X1 harness connector at the K36 SDM.

4.3.	Ignition ON.

4.4.	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, replace the K36 SDM.

⇓	If between 4.75-5.25 V

5. Replace the S40 passenger air bag disable switch.

1. Disconnect the harness connector at the S40 passenger air bag disable switch.
2. With the switch open, test for 380-420 Ω between the signal terminal 1 and the ground terminal 3.

⇒	If not between 380-420 Ω

Replace the S40 passenger air bag disable switch.

⇓	If between 380-420 Ω

3. With the switch closed, test for 95-105 Ω, between the signal terminal 1 and the ground terminal 3.

⇒	If not between 95-105 Ω

Replace the S40 passenger air bag disable switch.

⇓	If between 95-105 Ω

4. All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for SDM control module replacement, programming and setup