Signal Too Low

Signal too low

Checking the component and wiring








- Switch off the ignition. Wait 10 seconds
- Disconnect the connector from the driver's seat belt buckle
- Disconnect the 20-pin connector located under the driver's seat
- Disconnect the connectors from the supplemental restraint system module (SRS).

Caution! Do not touch the terminal pins in the supplemental restraint system module (SRS). There is a risk of static discharge. This could damage the supplemental restraint system module (SRS).

Check the 20-pin connector and the connectors to the seat belt buckle and the supplemental restraint system module (SRS). Check for damage to pins and terminals in the connectors.
Remedy as necessary.
Connect the 20-pin connector. Check the cable between the supplemental restraint system module (SRS) and the seat belt buckle connector. Check for a short-circuit to ground.
Check the cable between:
- Supplemental restraint system module (SRS) terminal #A64 and seat belt buckle connector terminal #1
- Supplemental restraint system module (SRS) terminal #A65 and seat belt buckle connector terminal #2.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting the Breakout Box, Supplemental Restraint System Module (SRS)
- Signal specification Signal Specification
- For further information about cable routing and terminals, see the wiring diagram
- To access or replace the seat belt buckle and the connectors, see: Front safety belt buckle Front Safety Belt Buckle
- To access or replace the supplemental restraint system module (SRS) and the connectors. See: Air bag supplemental restraint system Service and Repair
- For information about the repair of SRS wiring, see: Wiring harness supplemental restraint system (SRS) Wiring Harness Supplemental Restraint System (SRS)
- Checking wiring and terminals Checking Wiring and Terminals

Was a fault detected?

Yes - Verification

No - Checking the component

-------------------------------------------------

Checking the component




- Connect the connector to the driver's seat belt buckle
- Connect the connectors for the supplemental restraint system module (SRS)
- Switch on the ignition. Wait 10 seconds.
Check the current passing through the Hall sensor in the seat belt buckle. Check the current level when the seat belt buckle is locked and unlocked. When the seat belt buckle is not locked, the current level must be in the range 2.0 mA-5.0 mA. When the seat belt buckle is locked, the current level must be in the range 12.0 mA-17.0 mA.
Read off the current level by clicking on the VCT2000 symbol.
Replace the seat belt buckle if the current level is outside the interval indicated above.
Remedy as necessary.

Other information
- To access or replace the seat belt buckle and the connectors, see: Front safety belt buckle Front Safety Belt Buckle





Continue - Verification

-------------------------------------------------

Verification




Verification

Hint: After carrying out the repair check that the fault has been remedied.




- Switch off the ignition. Wait 10 seconds
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Ignition on
- Connect the battery negative lead. Wait 10 seconds.

Warning! There must not be anyone inside the passenger compartment when the battery is connected.

Read diagnostic trouble codes by clicking the VCT2000 symbol.
If the fault is intermittent, the fault has been remedied.





Is the fault intermittent?

Yes - VERIFIED

No - VERIFICATION FAILED

------------------------

VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

-------------------------------------------------

Fault-tracing information

FAULT-TRACING FAILED - No Fault Found

Attempt New Test - Checking the component and wiring

-------------------------------------------------