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 combined instrument panel 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 combined instrument panel terminal A:11.
Carry out fault tracing for an open-circuit.
- Continue with checking the connector.
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 combined instrument panel terminal A1l, or the SRS warning lamp bulb is defective.
Carry out fault tracing for a short-circuit to ground.
- Continue with checking to see if there is a short-circuit to ground in the cable to the combined instrument panel.
Checking The Connector
- 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 the large socket housing from connector A1.
- Check cable terminals in both the connector socket housing and the corresponding connector pin housing terminal C:4.
Cable terminals must not be damaged or pressed back.
- Check that socket housing and pin housing lock into each other.
If the socket housing and pin housing terminal C:4 are OK:
- Continue with checking voltage in cable.
If the connector A1 pin housing terminal C:4 is defective:
^ Replace the cable between connector A1 pin housing C terminal 4 and combined instrument panel connector5/l A terminal 11.
If connector A1 socket housing terminal C:4 is detective:
^ 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 pin terminal C:4 in connector A1 pin housing.
The voltmeter should read approx. 8V.
If the reading is OK:
No open-circuit in cable between connector A1 and combined instrument panel connector 5/1 A terminal 11.
The fault is probably in the cable between the connector 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 11 there is an open-circuit in the cable between connector A1 and combined instrument panel connector 5/1 A terminal 11.
^ Replace the cable between connector A1 pin housing terminal C:4 and combined instrument panel connector 5/1 A terminal 11.
Checking SRS Sensor Module Connector
- Ignition off.
- Disconnect battery negative lead.
- Expose and remove SRS sensor module connector.
CAUTION: 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 in accordance with: SRS Sensor Module - Replacement
If the female connector half is defective:
^ Replace SRS cable harness.
Checking resistance in cable
CAUTION: 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 A1 socket housing connecting socket terminal C:4.
The ohmmeter should read approx. 0 Ohm.
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, 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 sensor module connector terminal 7 and connector A1.
^ Replace sensor module in accordance with: SRS Sensor Module - Replacement
If the reading is abnormal:
If the ohmmeter reads infinity there is an open-circuit in the cable between the sensor module connector terminal 7 and connector A1.
^ Replace SRS cable harness.
Check To See If There Is A Short-circuit To Ground In The Cable To The Combined Instrument Panel
- 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: Knee Bolster - Replacement
- Remove the large socket housing from connector A1.
- Connect an ohmmeter between a good ground terminal and connecting pin terminal C:4 in connector A1 pin housing.
The ohmmeter should read approx. 1 kohms.
If the reading is OK:
No short-circuit to ground in cable between connector A1 and combined instrument panel connector 5/1 A terminal 11.
The fault is probably in the cable between connector A1 and the SRS sensor module, or a short-circuit to ground in the sensor module.
- Continue with check 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 A1 and the combined instrument panel connector 5/1 A terminal 11.
^ Replace the cable between connector A1 pin housing terminal C:4 and combined instrument panel connector 5/1 A terminal 11.
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 in accordance with: SRS Sensor Module - Replacement
CAUTION: 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 a good ground terminal and connector A1 socket housing connecting socket terminal C:4.
The ohmmeter should read infinity.
If the reading is OK:
No short-circuit to ground in the cable between connector A1 and sensor module connector terminal 7.
^ Replace sensor module in accordance with: 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 A1 and the sensor module connector terminal 7.
^ Replace SRS cable harness.