R023

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

During normal non-deployment operation of the SIR system, a small amount of current flows through both the driver's and passenger's deployment loops. The diagnostic resistors within the Dual Pole Arming Sensor and the Discriminating sensors along with the resistance of the Inflator Modules, cause voltage drops within the deployment loops. The DERM monitors the voltage at 'DRIVER'S SIDE LOW', terminal 'B8', to detect shorts or opens within the driver's deployment loop. When the measured voltage is above 50% of 'DRIVER'S 36 VLR' for 500 milliseconds, Code R023 is set.

TEST CONDITION(S)

Tested every 100 milliseconds while 'Continuous Monitoring' tests active.

FAILURE CONDITION(S)

Voltage at the 'DRIVER'S SENSE LOW', terminal 'B8', is greater than 50% of 'DRIVER'S 36 VLR', terminal A4', for 500 milliseconds.

ACTION TAKEN

1. DERM turns on the 'INFLATABLE RESTRAINT' indicator.

2. 'SERVICE SUPPLEMENTAL INFLATABLE RESTRAINT' message is displayed on DIC.

NOTES ON FAULT TREE

1. Codes R023 and R024 set together means that there is an open between the Driver's Inflator Module harness connector (C206) and the RH Discriminating Sensor interconnect. This causes the voltage to increase at 'DRIVER'S SIDE LOW' due to the loss of a ground path. This also causes the voltage to decrease at 'PASSENGER'S SIDE LOW' due to decreased current flow through the Discriminating Sensor network.

2. This test checks for an open in the RH Discriminating Sensor between terminal A and terminal 'D.

3. This test determines whether the fault is an open in CKT 348 or faulty DERM.

4. Use Code R019 for diagnosis because Codes R019 and R023 can set together and the circuits involved in setting both are diagnosed in Code R019.