SRS-222
Diagnostic Trouble Code (DTC) SRS-222 - Passenger Airbag, open-circuit or capacitance too lowSpecial tools:
- 998 8695
- Volvo Scan Tool (ST)
DTC Conditions
If resistance in the circuit is too high or capacitance too low for over 10 seconds, the diagnostic trouble code (DTC) SRS-222 is stored.
Cause of fault
Resistance too high.
- Open-circuit in the SRS ignition cable or connectors between passenger module and SRS sensor module.
- Open-circuit in passenger module (resistance too high in igniter).
Capacitance too low.
- Capacitance too low or open-circuit in the SRS ignition cable igniter connector capacitor.
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-222 if the fault is permanent.
If diagnostic trouble code (DTC) SRS-222 could not be cleared (the fault persists):
The fault is permanent.
- Continue with disconnecting passenger module connector.
If diagnostic trouble code (DTC) SRS-222 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 998 8695 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. Calibrating Special Tool 998 8695
- 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-222 if the fault is in the passenger module.
If diagnostic trouble code (DTC) SRS-222 could be cleared:
No fault detected by the SRS on-board diagnostic (OBD) system with the passenger module disconnected and replaced by special tool 998 8695.
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-222 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 checking SRS ignition cable connector 24/33.
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-222 should be stored.
If diagnostic trouble code (DTC) SRS-222 is present:
The open-circuit is 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
- Install special tool 9988695.
- Continue with checking SRS ignition cable connector.
Checking SRS Ignition Cable Connector 24/33
- Ignition off.
- Disconnect Connector 24/33 on SRS ignition cable.
- Check cable terminals in the female and male halves of the connector.
Cable terminals must not be damaged or pressed back.
- Connect connector 24/33. Check that male and female connector halves engage properly.
If the female and male connector halves are OK:
- Continue with checking the diagnostic trouble code (DTC) with the SRS ignition cable connector installed.
If the male connector half is defective:
^ Replace passenger module SRS ignition cable. Passenger Module Replacement
If the female connector half is defective:
^ Replace SRS cable harness.
Checking The Diagnostic Trouble Code (DTC) With The SRS Ignition Cable Connector Installed
- Switch ignition to position II.
- Connect battery negative lead.
- Read off diagnostic trouble code (DTC).
- Clear diagnostic trouble code (DTC).
It should not be possible to clear diagnostic trouble code (DTC) SRS-222 if the fault persists.
If diagnostic trouble code (DTC) SRS-222 could not be cleared:
The fault still exists.
- Continue with checking SRS ignition cable resistance.
If diagnostic trouble code (DTC) SRS-222 could be cleared:
The SRS on-board diagnostic (OBD) system has not detected a fault with the SRS ignition cable connector installed.
The fault is intermittent in the SRS ignition cable.
^ Replace passenger module SRS ignition cable. Passenger Module Replacement
Checking SRS Ignition Cable Resistance
- Ignition off.
- Disconnect battery negative lead.
- Remove special tool 9988695.
- Disconnect connector 24/33 on SRS ignition cable.
- Connect an ohmmeter between terminal 1 on male connector 24/33 (part A in the above figure) and terminal 1 on the igniter connector (left connecting pin, closest to the "service hole"). See connection in the figure.
The ohmmeter should read approx. 0 Ohms.
NOTE: If the ohmmeter test pins are too big to fit into the connector terminal holes, 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.
- Connect an ohmmeter between terminal 2 on male connector 24/33 and "service hole" on the igniter connector. See connection in the figure.
The ohmmeter should read approx. 0 Ohms.
If both readings are OK:
There is an open-circuit in the SRS ignition cable in the SRS cable harness between the connector 24/33 and the sensor module or there is a fault in the integral capacitor in the SRS ignition cable igniter connector.
- Continue with checking capacitor in the igniter connector.
If the reading is abnormal:
If the ohmmeter reads infinity in any reading there is an open-circuit in the SRS ignition cable.
^ Replace passenger module SRS ignition cable.
Checking Capacitor In The Igniter Connector
Resistance check
NOTE: If there is a measuring instrument with a capacitance measuring facility use Alternative capacitance check" on the next page.
An ohmmeter can be used to check the capacitor in the SRS ignition cable igniter connector.
- Ignition off.
- Connect measuring instrument terminals between the connector service hole and terminal 2 right connecting pin. See connection in the figure. (The capacitor will charge.)
The ohmmeter reading should increase rapidly and stop at infinity.
- Reverse the position of the ohmmeter positive and negative terminals and connect them to the connector as above. See connection in the figure. (The capacitor will discharge and charge.)
The ohmmeter reading should drop rapidly to approx. 0 Ohms and then increase to infinity.
Alternative Capacitance Check
A measuring instrument with a capacitance measuring facility can be used to check the capacitor in the SRS ignition cable igniter connector.
- Ignition off.
- Connect measuring instrument terminals between the connector "service hole" and terminal 2 right connecting pin. See connection in the figure.
The measuring instrument should read between 0.46 microfarad and 0.48 microfarad.
If the reading is OK:
There is no open-circuit in the capacitor.
- Continue with checking the resistance in the SRS ignition cable, SRS cable harness and sensor module.
If the reading is abnormal:
If the ohmmeter reading is constantly high without dropping or increasing there is an open-circuit in the capacitor.
^ Replace passenger module SRS ignition cable. Passenger Module Replacement
Checking The Resistance In The SRS Ignition Cable, SRS Cable Harness And Sensor Module
- Ignition off.
- Connect an ohmmeter between the connecting sockets in the sensor module female half of the connector 24/33 (pan B in the figure).
Take care not to damage terminal sockets.
The ohmmeter should read approx. 47 Kohms.
If the reading is 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 infinity there is a open-circuit in the SRS ignition cable in the SRS cable harness between the connector 24/33 and sensor module or an open-circuit in the sensor module.
- Continue with checking SRS sensor module connector.
Checking SRS Sensor Module Connector
- Ignition off.
- Expose and remove SRS sensor module connector. SRS Sensor Module - Replacement
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 half of the connector and the male half of the sensor module.
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 the SRS ignition cable in the SRS cable harness.
If the male sensor module connector half is defective:
^ Replace sensor module. SRS Sensor Module - Replacement
If the female connector half is defective:
^ Replace SRS cable harness. SRS Sensor Module - Replacement
Checking Resistance In The SRS Ignition Cable In The SRS Cable Harness
CAUTION: Never touch the sensor module pins. There is a risk of static discharge which could damage the sensor module.
Connect an ohmmeter between the female SRS ignition cable connector 24/33 and the SRS sensor module connector.
- Ignition off.
- Connect an ohmmeter between sensor module connector terminal 13 and female connector 24/33 terminal 1.
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, and take readings from that. Take care not to damage the connector cable terminals.
- Connect an ohmmeter between sensor module connector terminal 14 and female connector 24/33 terminal 2.
The ohmmeter should read approx. 0 Ohms.
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 infinity in any of the readings taken, there is an open-circuit in the SRS ignition cable in the SRS cable harness between connector 24/33 and the sensor module connector.
^ Replace SRS cable harness. SRS Sensor Module - Replacement