DTC 053. Chevrolet Optra 2005

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2005 🢒 Optra 🢒 Restraints 🢒 SIR 🢒 DTC 053

Circuit Description

When the ignition switch is turned to ON, the sensing and diagnostic module (SDM) will perform a turn-on test to diagnose critical malfunctions within the SDM itself.

Upon passing this test, ignition and deployment loop voltages are measured to ensure that they are within the normal voltage ranges. The SDM monitors the voltages at the driver low and the passenger low to detect shorts to ground or voltage in the deploy loops.

Conditions for Setting the DTC

•	The resistance of the driver side air bag deployment loop is lower than 1.4 ohms.

•	The shorting bar is damaged and then the SDM must be replaced.

Step	Action	Values	Yes	No
Caution: Refer to Sensing and Diagnostic Module Voltage after Ignition is Turned Off Caution in the Preface section. Caution: Refer to Sensing and Diagnostic Module Handling Caution in the Preface section.
1	Perform the Diagnostic System Check - SIR. Did you perform the Diagnostic System Check - SIR?	--	Go to Step 2	Go to Diagnostic System Check - SIR
2	Disconnect the driver side air bag module. Disconnect the connector of the sensing and diagnostic module (SDM). Connect an ohmmeter to the terminals of the wiring harness connector for the driver side air bag module. Does the ohmmeter show the specified value?	∞	Go to Step 3	Go to Step 5
3	Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Reconnect the negative battery cable. Set the scan tool to CODE ERASE. Perform the Diagnostic System Check - SIR. Is DTC 053 still shown as a current fault?	--	Go to Step 4	System OK
4	Replace the driver side air bag module. Reconnect the negative battery cable. Did you complete the repair?	--	Go to Diagnostic System Check - SIR	--
5	Replace the supplemental inflatable restraints (SIR) wiring harness. Reconnect the negative battery cable. Did you complete the repair?	--	Go to Diagnostic System Check - SIR	--