When you first turn the ignition switch to the ON position, the inflatable restraint Sensing and Diagnostic Module (SDM) performs tests to diagnose critical malfunctions within itself. The SDM monitors the voltages at DRIVER SIDE LOW terminal 9 and PASSENGER SIDE LOW terminal 8 to detect shorts-to-B+ in the inflator module circuits.
The SDM detects a short to battery voltage in the passenger deployment loop.
• | The SDM sets a Diagnostic Trouble Code. |
• | The SDM turns ON the AIR BAG warning lamp. |
All DTCs are cleared with each ignition cycle.
A short to B+ in the inflatable restraint IP module circuit can cause an intermittent condition. Inspect the YEL/RED and YEL/GRN wires leading to the IP module carefully for cut or chafed wires.
This test checks for a short to voltage in the passenger side high circuit.
This test checks for a short to voltage in the passenger side low circuit.
This test determines if the malfunction is caused by the SDM.
This test determines if the malfunction is caused by the inflatable restraint instrument panel module.
Step | Action | Value(s) | Yes | No |
---|---|---|---|---|
1 | Was the SIR Diagnostic System Check performed? | -- | ||
Is the voltage measured greater than the specified value? | 0 V | |||
Measure the voltage at the inflatable restraint IP module harness connector between terminal 2 and ground. Is the voltage measured greater than the specified value? | 0 V | |||
Is DTC 52 present? | -- | |||
Is DTC 52 present? | -- | |||
6 | Replace the inflatable restraint Sensing and Diagnostic Module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Are all the repairs complete? | -- | -- | |
7 | Replace the inflatable restraint IP module. Refer to Inflatable Restraint Instrument Panel Module Replacement . Are all the repairs complete? | -- | -- | |
8 | Repair a short to voltage in the YEL/RED wire between the IP module and the SDM. Refer to Wiring Repair in this section. Are all the repairs complete? | -- | -- | |
9 | Repair a short to voltage in the YEL/GRN wire between the IP module and the SDM. Refer to Wiring Repair in this section. Are all the repairs complete? | -- | -- | |
10 | An intermittent exists in the passenger deployment loop. Refer to Diagnostic Aids. Are all the repairs complete? | -- | -- | |
11 | Reconnect all SIR components. Make sure all components are properly mounted. Have all the SIR components been reconnected and properly mounted? | -- | -- |