SRS-128

Diagnostic Trouble Code (DTC) SRS-128 - SRS warning lamp, short-circuit to supply voltage

DTC Conditions
If voltage in the cable is high tar over 40 seconds, the diagnostic trouble code (DTC) SRS-128 is stored.

This diagnostic trouble code (DTC) is only posted when the engine is running.

Cause of fault
Short-circuit to supply voltage in the cable or connectors between the combination instrument and sensor module.

Fault symptoms
No symptoms apart from the SRS warning lamp lighting.

Action
The fault can be found by a process of elimination.

NOTE: Follow the operations carefully and carry out operations in the correct order.

Checking fault symptom




- Switch ignition to position II.
- Check to see it the SRS warning lamp in the combination instrument is lit.

If the SRS warning lamp is lit:




If the SRS warning lamp is lit and diagnostic trouble code (DTC) SRS-128 is stored, there is a short-circuit to supply voltage in the cable between the SRS sensor module and the combination instrument terminal B:3.
- Continue with check to see if there is a short-circuit to supply voltage in the cable to the combination instrument.

If the SRS warning lamp is not lit:




If the SRS warning lamp is not lit and diagnostic trouble code (DTC) SRS-128 is stored, the SRS warning lamp bulb is defective. There is a short-circuit to supply voltage in the cable between the SRS sensor module and the combination instrument terminal B:3.
- Replace SRS warning lamp bulb in the combination instrument.
- Continue with check to see if there is a short-circuit to supply voltage in the cable to the combination instrument.

Check to see if there is a short-circuit to supply voltage in the cable to the combination instrument




- Make a note of radio code if anti-theft coded radio installed.
- Ignition off.




- Disconnect battery negative lead.




- Remove left soundproofing panel and knee bolster in accordance with EK1.
- Remove socket housing E from connector 24/1.




- Disconnect battery positive lead.












- Ignition key in position II.
- Connect an ohmmeter between battery positive lead and connecting socket terminal 11 in socket housing E.

The ohmmeter should read approx. 1 Kohms.

If the reading is OK:
No short-circuit to supply voltage in the cable between connector 24/1 socket housing E terminal 11 and combination instrument 5/1 connector B terminal 3.

The fault is probably in the cable between connector 24/1 pin housing E terminal 11 and the SRS sensor module or there is a short-circuit to supply voltage in the sensor module.
- Continue with checking to see if there is a short-circuit to supply voltage in the cable to the sensor module.

If the reading is abnormal:
If the ohmmeter reads approx. 0 Ohms there is a short-circuit to supply voltage in the cable between connector 24/1E terminal 11 and the combination instrument 5/1.
^ Replace cable between connector 24/1 socket housing E terminal 11 and combination instrument 5/1 connector B terminal 3.

Check to see if there is a short-circuit to supply voltage in the cable to the sensor module




- Ignition off.




- Expose and remove SRS sensor module connector. SRS Sensor Module - Replacement





NOTE: Never touch the sensor module pins. There is a risk of static discharge which could damage the sensor module.












- Ignition key in position II.
- Connect an ohmmeter between a battery positive lead and connector 24/1 part E connecting pin terminal 11 where the disconnected socket housing was connected.

The ohmmeter should read infinity.

If the reading is OK:
No short-circuit to supply voltage in the cable between connector 24/1 pin housing E terminal 11 and sensor module connector terminal 7.
^ Replace sensor module. SRS Sensor Module - Replacement

If the reading is abnormal:
If the ohmmeter reads approx. 0 Ohms there is a short-circuit to supply voltage in the cable between connector 24/1 pin housing E terminal 11 and sensor module connector terminal 7.
^ Replace SRS cable harness.