SRS-224
Diagnostic Trouble Code (DTC) SRS-224 - Passenger Airbag, short-circuit to supply voltageSpecial tools:
- 998 8695
- Volvo Scan Tool (ST)
DTC Conditions
If voltage in the circuit is high for over 10 seconds, the diagnostic trouble code (DTC) SRS-224 is stored.
Cause of fault
Voltage too high.
- Short-circuit to supply voltage in the SRS ignition cable or connectors between passenger module and SRS sensor module.
- Short-circuit to supply voltage in passenger module.
Fault symptoms
No symptoms apart from the SRS warning lamp coming on.
WARNING: There is a risk that the SRS passenger module will not work if this DTC is posted.
Action
The fault can be found by a process of elimination.
WARNING: Under no circumstances use an ohmmeter or other live measuring instrument to take readings on a disconnected non-deployed passenger module. This could deploy the airbag.
NOTE: Follow the operations described in this chapter carefully and carry out operations in the correct order.
Checking Diagnostic Trouble Code (DTC) And Type Of Fault
Before starting to remove components, the Volvo Scan Tool (ST) should be used to check whether the fault is permanent or intermittent.
- Connect the Volvo Scan Tool (ST). Reading and Clearing Diagnostic Trouble Codes
- Read off diagnostic trouble code (DTC).
- Clear diagnostic trouble code (DTC).
It should not be possible to clear diagnostic trouble code (DTC) SRS-224 if the fault is permanent.
If diagnostic trouble code (DTC) SRS-224 could not be cleared (the fault persists):
The fault is permanent.
- Continue with disconnecting passenger module connector.
If diagnostic trouble code (DTC) SRS-224 could be cleared:
The fault is not permanent. The fault could be intermittent.
Attempt to provoke the intermittent fault at every step of the fault tracing process by shaking connectors and cabling while taking readings.
- Continue with disconnecting passenger module connector.
Disconnecting Passenger Module Connector
- Make a note of radio code if anti-theft coded radio installed.
- Ignition off.
- Disconnect battery negative lead.
- Remove glove compartment.
- Disconnect passenger module connector.
WARNING: Under no circumstances use an ohmmeter or other live measuring instrument to take readings on a disconnected non-deployed passenger module. This could deploy the airbag.
- Continue with checking DTCs with the passenger module replaced by special tool 9988695.
Checking DTCs With The Passenger Module Replaced By Special Tool 9988695
- Connect special tool 9988695 to SRS ignition cable igniter connector.
NOTE: The special tool should be checked and defect-free. If the tool is defective it will cause errors in the diagnosis and make fault tracing harder. If in doubt check the special tool.
- Switch ignition to position II.
- Connect battery negative lead.
- Read off diagnostic trouble code (DTC).
- Clear diagnostic trouble code (DTC).
It should be possible to clear diagnostic trouble code (DTC) SRS-224 if the fault is in the passenger module.
If diagnostic trouble cede (DTC) SRS-224 could be cleared:
No fault detected by the SRS on-board diagnostic (OBD) system with the passenger module disconnected and replaced by special tool 9988695.
The fault is probably in the passenger module.
One last check should be made before replacing the passenger module.
- Continue with installing passenger module connector.
If diagnostic trouble code (DTC) SRS-224 could not be cleared (the fault persists):
The fault persists even with the passenger module disconnected. This means that the passenger module is OK.
The fault is probably in the SRS ignition cable.
- Continue with installing passenger module connector.
Installing Passenger Module Connector
- Ignition off.
- Disconnect battery negative lead.
- Remove special tool 9988695.
- Connect connector to passenger module.
WARNING: Under no circumstances use an ohmmeter or other live measuring instrument to take readings on a disconnected non-deployed passenger module. This could deploy the airbag.
- Continue with checking diagnostic trouble code (DTC) with the passenger module connected.
Checking Diagnostic Trouble Code (DTC) With The Passenger Module Connected
- Switch ignition to position II.
- Connect battery negative lead.
- Read off diagnostic trouble code (DTC).
If the fault is in the passenger module diagnostic trouble code (DTC) SRS-224 should be stored.
If diagnostic trouble code (DTC) SRS-224 is present:
There is a short-circuit in the passenger module.
^ Replace passenger module. Passenger Module Replacement
If no diagnostic trouble code (DTC) is present:
The SRS on-board diagnostic (OBD) system has not detected a fault with the passenger module connected.
The fault could be intermittent in the SRS ignition cable.
- Continue with disconnecting passenger module connector.
Disconnecting Passenger Module Connector
- Ignition off.
- Disconnect battery negative lead.
- Disconnect passenger module connector.
WARNING: Under no circumstances use an ohmmeter or other live measuring instrument to take readings on a disconnected non-deployed passenger module. This could deploy the airbag.
- Continue with checking to see it the SRS ignition cable is short-circuited to supply voltage.
Checking To See If The SRS Ignition Cable Is Short-circuited To Supply Voltage
- Ignition off.
- Disconnect battery negative lead.
- Remove special tool 9988695.
- Disconnect connector 24/33 on SRS ignition cable.
- Remove SRS ignition cable.
- Check that SRS ignition cable sleeve is in good condition (for a short-circuit to supply voltage).
If the SRS ignition cable is OK:
The fault is probably in the SRS ignition cable in the SRS cable harness between the connector 24/33 and the sensor module, or there is a short-circuit to supply voltage in the sensor module.
- Continue with checking to see if the SRS ignition cable in the SRS cable harness and the sensor module are short-circuited to supply voltage.
If the SRS ignition cable is defective:
^ Replace passenger module SRS ignition cable. Passenger Module Replacement
Checking To See If The SRS Ignition Cable In The SRS Cable Harness And The Sensor Module Are Short-circuited To Supply Voltage
- Disconnect battery positive lead.
- Ignition to position II.
Connect an ohmmeter between the battery positive lead and the connecting sockets in the SRS sensor module half of connector 24/33 (part B in the figure).
Take care not to damage connecting sockets.
- Connect one ohmmeter test terminal to the battery positive lead.
- Take an ohmmeter reading with the other test terminal against the female connector half terminal 1.
- Then take an ohmmeter reading against female connector half terminal 2.
The ohmmeter should read approx. 25 Kohms or approx. 72 Kohms.
If both readings are OK:
SRS ignition cable in the SRS cable harness between connector 24/33 and the sensor module is OK.
^ Replace passenger module SRS ignition cable. Passenger Module Replacement
If the reading is abnormal:
If the ohmmeter reads approx. 0 Ohms for terminals 1 or 2, there is either a short-circuit to supply voltage in the SRS ignition cable in the SRS cable harness between connector 24/33 and the sensor module, or there is a short-circuit to supply voltage in the sensor module.
- Continue with checking to see if the SRS ignition cable In the SRS cable harness is short-circuited to supply voltage.
Checking To See If The SRS Ignition Cable In The SRS Cable Harness Is Short-circuited To Supply Voltage
- Ignition off.
- Expose and remove SRS sensor module connector.
NOTE: Never touch the sensor module pins. There is a risk of static discharge which could damage the sensor module.
- Ignition to position II.
Connect an ohmmeter between the battery positive lead and the connecting sockets in the SRS sensor module half of connector 24/33 (part B in the figure).
Take care not to damage connecting sockets.
- Connect one ohmmeter test terminal to the battery positive lead.
- Take an ohmmeter reading with the other test terminal against the female connector half terminal 1.
- Then take an ohmmeter reading against female connector half terminal 2.
The ohmmeter should read infinite resistance in both cases.
If both readings are OK:
SRS ignition cable in the SRS cable harness between connector 24/33 and the sensor module is OK.
^ Replace sensor module. SRS Sensor Module - Replacement
If the reading is abnormal:
If the ohmmeter reads approx. 0 Ohms for terminals 1 or 2, there is either a short-circuit to supply voltage in the SRS ignition cable in the SRS cable harness between the connector 24/33 and the sensor module.
^ Replace SRS cable harness.