Component Tests and General Diagnostics

Checking the supply voltage/ground terminal

Power supply, supplemental restraint system module (SRS)
The supplemental restraint system module (SRS) is powered via two power inputs.
When the ignition is on, both voltage inputs are powered and the Supplemental restraint system module (SRS) is in active mode.
1. Power input 1 terminal #C2:68(#A43) is powered via a fuse from the relay for 15 supply.
2. Power input 2 #C2:67(#A42) is powered via a fuse from the relay for 15 supply, onwards, via the central electronic module (CEM) and further to a fuse.
In the event of an open-circuit in both of the power inputs, the supplemental restraint system module (SRS) will not be activated.
In the event of an open-circuit in one of the power inputs, the supplemental restraint system module (SRS) resumes normal function.

Checking the power supply
Check the power supply from the battery to Supplemental restraint system module (SRS) terminal #C2:68(#A43). Check for an open-circuit. Check for loose connections, contact resistance and oxidation. Also check the relay and the fuse. The voltage must be approximately battery voltage when the ignition is on.
Check the power supply from the battery to Supplemental restraint system module (SRS) terminal #C2:67(#A42). Check for an open-circuit. Check for loose connections, contact resistance and oxidation. Also check the relay and the fuses. The voltage must be approximately battery voltage when the ignition is on.

Ground terminal, supplemental restraint system module (SRS)
The metal plate on the Supplemental restraint system module (SRS) functions as a terminal for power ground. Supplemental restraint system module (SRS) is grounded by the control module being screwed into place in the vehicle.

Checking the ground terminal
Check the ground connection between the metal plate on the Supplemental restraint system module (SRS) and the ground terminal in the body. With the ignition on and with the Supplemental restraint system module (SRS) secured in the vehicle, the resistance between the control module's metal plate and ground terminal in the body should be approximately 0 ohms.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting The Breakout Box, Supplemental Restraint System Module (SRS)
- Signal specification Signal Specification, Supplemental Restraint System Module (SRS)
- See the relevant wiring diagram for information about circuits and ground terminals in the bodywork.
- Checking wiring and terminals Checking Wiring And Terminals

Continue - DONE

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