Open-Circuit Or Capacitance Too Low
Open-circuit or capacitance too low
Checking diagnostic trouble code (DTC) and type of fault
Hint: Before starting to remove components, the Volvo Scan Tool (ST) should be used to check whether the fault is permanent or intermittent.
Clear diagnostic trouble code (DTC).
Continue - Checking diagnostic trouble code (DTC) and type of fault, continuation
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Checking diagnostic trouble code (DTC) and type of fault, continuation
- Wait at least 10 seconds.
Read off diagnostic trouble code (DTC).
It should not be possible to clear diagnostic trouble code (DTC) SRS-222 if the fault is permanent.
Can diagnostic trouble code (DTC) SRS-222 be cleared?
Yes - If diagnostic trouble code (DTC) SRS 222 be could be cleared
No - Disconnecting passenger module connector
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If diagnostic trouble code (DTC) SRS 222 be 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 - Disconnecting passenger module connector
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Disconnecting passenger module connector
Disconnecting connector from passenger module
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 in accordance with Passenger module, replacement Passenger Module, Replacement.
- 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 - CONTINUE
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Continue - Verification
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Checking DTCs with the passenger module replaced by special tool 998 8695
- Connect special tool 998 8695 TEST DEVICE 998 8695 Test Device to SRS ignition cable igniter connector.
Caution! 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.
- Ignition on.
- Connect battery negative lead.
Clear diagnostic trouble code (DTC).
Continue - Checking DTCs with the passenger module replaced by special tool 998 8695, continuation
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Checking DTCs with the passenger module replaced by special tool 998 8695, continuation
- Ignition on.
- Wait at least 10 seconds.
Read off diagnostic trouble code (DTC).
It should be possible to clear diagnostic trouble code (DTC) SRS-222 if the fault is in the passenger module.
Can diagnostic trouble code (DTC) SRS-222 be cleared?
Yes - Installing connector to passenger module
No - Checking SRS ignition cable connector 24/33
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Installing connector to passenger module
Installing connector to passenger module
Installing passenger module connector
- Ignition off.
- Disconnect battery negative lead.
- Remove special tool 998 8695 TEST DEVICE 998 8695 Test Device.
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!
- Connect connector to passenger module.
Continue - CONTINUE
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CONTINUE - Checking diagnostic trouble code (DTC) with the passenger module connected
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Checking diagnostic trouble code (DTC) with the passenger module connected
- Ignition on.
- Connect battery negative lead.
- Wait at least 10 seconds.
Read off diagnostic trouble code (DTC).
If the fault is in the passenger module diagnostic trouble code (DTC) SRS-222 should be stored.
Is diagnostic trouble code (DTC) SRS-222 present?
Yes - Replacing component
No - Disconnecting connector from passenger module
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Replacing component
The open-circuit is in the passenger module.
- Replace passenger module in accordance with Passenger module, replacement Passenger Module, Replacement.
Continue - FAULT FOUND
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Disconnecting connector from passenger module
Disconnecting connector from passenger module
Disconnecting connector from passenger module
- Ignition off.
- Disconnect battery negative lead.
- Disconnect connector from 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!
- Install special tool 998 8695 TEST DEVICE 998 8695 Test Device.
Continue - CONTINUE
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CONTINUE - Checking SRS ignition cable connector 24/33
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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.
Caution! Cable terminals must not be damaged or pressed back.
- Connect connector 24/33. Check that male and female connector halves engage properly.
- 1. Female and male connector halves are OK.
- 2. Male connector half is defective.
- 3. Female connector half is defective.
Select one of the above alternatives.
1 - Checking the diagnostic trouble code (DTC) with the SRS ignition cable connector installed
2 - Replacing component
3 - Replacing component
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Replacing component
- Replace passenger module SRS ignition cable in accordance with Passenger module, replacement Passenger Module, Replacement.
Continue - FAULT FOUND
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Replacing component
- Replace SRS cable harness.
Continue - FAULT FOUND
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Checking the diagnostic trouble code (DTC) with the SRS ignition cable connector installed
- Ignition on.
- Connect battery negative lead.
Clear diagnostic trouble code (DTC).
Continue - Checking the diagnostic trouble code (DTC) with the SRS ignition cable connector installed, continuation
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Checking the diagnostic trouble code (DTC) with the SRS ignition cable connector installed, continuation
- Ignition on.
- Wait at least 10 seconds.
Read off diagnostic trouble code (DTC).
It should not be possible to clear diagnostic trouble code (DTC) SRS 222 if the fault persists.
Can diagnostic trouble code (DTC) SRS-222 be cleared?
Yes - Replacing component
No - Checking SRS ignition cable resistance
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Replacing component
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 in accordance with Passenger module, replacement Passenger Module, Replacement.
Continue - FAULT FOUND
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Checking SRS ignition cable resistance
- Ignition off.
- Disconnect battery negative lead.
- Remove special tool 998 8695 TEST DEVICE 998 8695 Test Device.
- 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.
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.
The ohmmeter must read approximately 0 ohms.
Is the value OK?
OK - Checking SRS ignition cable resistance, continuation
Not OK - Replacing component
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Checking SRS ignition cable resistance, continuation
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 must read approximately 0 ohms.
Is the value OK?
OK - Selecting measuring instrument
Checking igniter connector capacitor, measuring resistance
Not OK - Replacing component
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Replacing component
If the ohmmeter reads infinity in any reading there is an open circuit in the SRS ignition cable.
- Replace passenger module SRS ignition cable in accordance with Passenger module, replacement Passenger Module, Replacement.
Continue - FAULT FOUND
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Selecting measuring instrument
When checking igniter connector capacitor use either a resistance or capacitance measuring instrument
Hint: If you have a capacitance measuring instrument use this.
1. Measuring resistance.
2. Measuring capacitance.
Select one of the alternatives above.
1 - Checking igniter connector capacitor, measuring resistance
2 - Checking igniter connector capacitor, measuring capacitance
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Checking igniter connector capacitor, measuring resistance
- 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.
Is the reading OK?
Yes - Checking the resistance in the SRS ignition cable, SRS cable harness and sensor module
No - Replacing component
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Checking igniter connector capacitor, measuring capacitance
- 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 microF and 0.48 microF.
Is the reading OK?
Yes - Checking the resistance in the SRS ignition cable, SRS cable harness and sensor module
No - Replacing component
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Replacing component
The ohmmeter reading is constantly high without dropping or increasing there is an open circuit in the capacitor.
- Replace passenger module SRS ignition cable in accordance with Passenger module, replacement Passenger Module, Replacement.
Continue - FAULT FOUND
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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 (part B in the figure).
Caution! Take care not to damage connector pins.
The ohmmeter should read approx. 47 kohms.
Is the value OK?
OK - Replacing component
Not OK - Checking the sensor module connector
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Replacing component
SRS ignition cable in the SRS cable harness between connector 24/33 and the sensor module is OK.
- Replace passenger module SRS ignition cable in accordance with Passenger module, replacement Passenger Module, Replacement.
Continue - FAULT FOUND
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Checking the sensor module connector
- Ignition off.
- Expose and remove the SRS sensor module connector according to: Replacing the SRS sensor module Service and Repair
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.
Caution! 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.
- 1. Female and male connector halves are OK.
- 2. Male sensor module connector half is defective.
- 3. Female connector half is defective.
Select one of the above alternatives.
1 - Checking resistance in the SRS ignition cable in the SRS cable harness
2 - Replacing component
3 - Replacing component
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Replacing component
- Replace the sensor unit according to: Replacing the SRS sensor module Service and Repair
Continue - FAULT FOUND
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Replacing component
- Replace SRS cable harness.
Continue - FAULT FOUND
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Checking resistance in the SRS ignition cable in the SRS cable harness
- Ignition off.
Caution! Never touch the sensor module pins. There is a risk of static discharge which could damage the sensor module.
Connect an ohmmeter between sensor module connector terminal 13 and female connector 24/33 terminal 1.
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.
The ohmmeter should read 0 ohms.
Is the value OK?
OK - Checking resistance in the SRS ignition cable in the SRS cable harness, continuation
Not OK - Replacing component
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Checking resistance in the SRS ignition cable in the SRS cable harness, continuation
Connect an ohmmeter between sensor module connector terminal 14 and female connector 24/33 terminal 2.
The ohmmeter must read approximately 0 ohms.
Is the value OK?
OK - Replacing component
Not OK - Replacing component
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Replacing component
SRS ignition cable in the SRS cable harness between connector 24/33 and the sensor module is OK.
Replace the sensor unit according to: Replacing the SRS sensor module Service and Repair
Continue - FAULT FOUND
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Replacing component
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.
Continue - FAULT FOUND
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