SRS-127
Diagnostic Trouble Code (DTC) SRS-127 - SRS warning lamp, open-circuit or short-circuit to groundDTC Conditions
If resistance in the cable is too high or if the voltage is low (0 V) for more than 40 seconds, diagnostic trouble code (DTC) SRS-127 will be stored.
This diagnostic trouble code (DTC) is only posted when the engine is running.
Cause Of Fault
Open-circuit or short-circuit to ground in the cable or connectors between the combination instrument and the sensor module.
Fault Symptoms
In case of an open-circuit the SRS warning lamp lights. In case of short-circuit to ground the SRS warning lamp does not light.
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 if 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-127 is stored there is probably an open-circuit in the cable between the SRS sensor module and the combination instrument terminal B:3. Carry out fault tracing for an open-circuit.
- Continue with CC2.
If the SRS warning lamp is not lit:
If the SRS warning lamp is not lit and diagnostic trouble code (DTC) SRS-127 is stored there is probably an short-circuit to ground in the cable between the SRS sensor module and the combination instrument terminal B:3, or the SRS warning lamp bulb is defective. Carry out fault tracing for an short-circuit to ground.
- Continue with CC6.
Checking connector 24/1
- Make a note of radio code if anti-theft coded radio installed.
- Ignition oft.
- Disconnect battery negative lead.
- Remove left soundproofing panel and knee bolster.
- Remove socket housing E from connector 24/1.
- Check cable terminals in both the connector socket housing and the corresponding connector pin housing terminal 11.
Cable terminals must not be damaged or pressed back.
- Install and remove socket housing E from the connector. Check that socket housing and pin housing lock into each other.
If the socket housing and pin housing are OK:
- Continue with checking voltage in cable.
If connector socket housing is defective:
^ Replace cable between connector 24/1 socket housing E terminal 11 and 5/1 combination instrument connector B terminal 3.
If connector pin housing is defective:
^ Replace SRS cable harness.
Checking voltage in cable
- Switch ignition to position II.
- Connect battery negative lead.
- Connect a voltmeter between a good ground terminal and connecting socket terminal 11 in socket housing E.
The voltmeter should read approx. 8 V.
If the reading is OK:
No open-circuit 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.
- Continue with checking SRS sensor module connector.
If the reading is abnormal:
If the voltmeter reads approx. 0 V with the ignition in position II there is an open-circuit in the cable between connector 24/1 E terminal 11 and combination 5/1.
^ Replace cable between connector 24/1 socket housing E terminal 11 and combination instrument 5/1 connector B terminal 3.
Checking SRS sensor module connector
- Ignition off.
- Disconnect battery negative lead.
- 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.
- Check cable terminals in the female connector half and male sensor module connector half.
- Cable terminals must not be damaged or pressed back.
- Install and remove connector from sensor module. Check that the connector locks into the sensor module.
If the female and male connector halves are OK:
- Continue with checking resistance in cable.
If the male sensor module connector half is defective:
^ Replace sensor module. Steering Wheel Module, Contact Reel - Replacement
If the female connector half is defective:
^ Replace SRS cable harness.
Checking resistance in cable
NOTE: Never touch the sensor module pins. There is a risk of static discharge which could damage the sensor module.
- Ignition off.
- Connect an ohmmeter between sensor module connector terminal 7 and connector 24/1 pan E connecting pin terminal 11, where the disconnected socket housing was connected.
The ohmmeter should read approx. 0 Ohms.
NOTE: If the ohmmeter test pins are too big to fit into the sensor module connector, insert a thin metal rod (or a piece of stripped cable) with a maximum diameter of 1 mm (0.04"), and take readings from that. Take care not to damage the connector cable terminals.
If the reading is OK:
No open-circuit 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 infinity there is an open-circuit in the cable between connector 24/1 pin housing E terminal 11 and sensor module connector terminal 7.
^ Replace SRS cable harness.
Check to see if there is a short-circuit to ground 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.
- Connect an ohmmeter between a good ground terminal 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 ground 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 ground in the sensor module.
- Continue with checking to see if there is a short-circuit to ground 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 ground in the cable between connector 24/1 E 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 ground 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.
- Connect an ohmmeter between a good ground terminal and connector 24/1 part E and 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 ground 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 ground in the cable between connector 24/1 pin housing E terminal 11 and sensor module connector terminal 7.
^ Replace SRS cable harness.