Open-Circuit Or Capacitance Too Low
Open-circuit or capacitance too low
Checking DTCs and type of fault
Hint: Before removing components, Volvo System Tester must be used to check if the fault is permanent or intermittent.
Erase diagnostic trouble codes
Continue - Checking DTCs and type of fault, continued
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Checking DTCs and type of fault, continued
- Wait at least 10 seconds.
Read off diagnostic trouble code (DTC).
It must not be possible to erase DTC SRS-212 if the fault is permanent.
Can DTC SRS-212 be erased?
Yes - DTC SRS-212 could be erased
No - Removal of the steering wheel module
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DTC SRS-212 could be erased
The fault is permanent. The fault may be intermittent. Try to provoke the intermittent fault at each work procedure during continued fault-tracing by shaking the connectors and cables, also turn the steering wheel during measurement.
Continue - Removal of the steering wheel module
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Removal of the steering wheel module
Removing steering wheel module
Removing steering wheel module
- Make a note of radio code if anti-theft coded radio installed.
- Ignition off.
- Disconnect battery negative lead.
- Remove steering wheel module in accordance with Steering wheel module, steering wheel and contact reel, replacement Airbag Steering Wheel Module, Steering Wheel and Contact Reel Replacement.
Warning! Under no circumstances use an ohmmeter or other live measuring instrument to take readings on a disconnected non-deployed steering wheel module. This could deploy the airbag.
Caution! Put the steering wheel module with its metal side (back) down in a protected place (in the cargo compartment for example).
Continue - CONTINUE
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CONTINUE - Checking DTCs with the steering wheel module replaced with special tool T998 8695
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Checking DTCs with the steering wheel module replaced with special tool T998 8695
- Connect the special tool to the SRS igniter cable's connector: 998 8695 TEST DEVICE 998 8695 Test Device
Caution! The special tool must be checked and must be fault free. If the tool is damaged, the diagnostic readings will be incorrect. This will make fault-tracing harder.
- Ignition on.
- Connect the battery's negative lead.
Erase the diagnostic trouble code (DTC).
Continue - Checking DTCs with the steering wheel module replaced with special tool T998 8695, continued
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Checking DTCs with the steering wheel module replaced with special tool T998 8695, continued
- Ignition on.
Read off diagnostic trouble code (DTC).
It must be possible to erase DTC SRS-212 if the fault is in the steering wheel module.
Can DTC SRS-212 be erased?
Yes - Reinstalling the steering wheel module.
No - Removal of the steering column covers
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Reinstalling the steering wheel module.
Installing steering wheel module
Installing steering wheel module
- Ignition off.
- Disconnect battery negative lead.
- Remove the special tool 998 8695 TEST DEVICE 998 8695 Test Device.
- Connect connector to steering wheel module.
- Install steering wheel module as per Steering wheel module, steering wheel and contact reel, replacement Airbag Steering Wheel Module, Steering Wheel and Contact Reel Replacement.
Warning! Under no circumstances use an ohmmeter or other live measuring instrument to take readings on a disconnected non-deployed steering wheel module. This could deploy the airbag.
Continue - CONTINUE
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CONTINUE - Checking DTCs with the steering wheel module reinstalled
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Checking DTCs with the steering wheel module reinstalled
- Ignition on.
- Connect the battery's negative lead.
- Wait at least 10 seconds.
Read off diagnostic trouble code (DTC).
DTC SRS-212 must be stored if the fault is in the steering wheel module.
Is DTC SRS-212 displayed?
Yes - Replacing a component
No - Removal of the steering wheel module
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Replacing a component
The open-circuit is in the steering wheel module.
- Replace steering wheel module according to: Steering wheel module, steering wheel and contact reel, replacement Airbag Steering Wheel Module, Steering Wheel and Contact Reel Replacement
Select continue when the defect has been remedied.
Continue - FAULT FOUND
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Removal of the steering wheel module
Removing steering wheel module
Removing steering wheel module
- Ignition off.
- Disconnect battery negative lead.
- Remove the steering wheel module.
Warning! Under no circumstances use an ohmmeter or other live measuring instrument to take readings on a disconnected non-deployed steering wheel module. This could deploy the airbag.
Caution! Put the steering wheel module with its metal side (back) down in a protected place (in the cargo compartment for example).
- Install special tool 998 8695 TEST DEVICE 998 8695 Test Device.
Continue - CONTINUE
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CONTINUE - Removal of the steering column covers
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Removal of the steering column covers
Removing steering wheel covers
Removing steering wheel covers
- Ignition off.
- Disconnect battery negative lead.
Remove
- Screws in countersunk outer holes (2 x Torx 15) from beneath cover.
- Screws in inner holes (2 x Torx 25) from beneath cover.
- Ignition key.
- Upper and lower cover from the steering column.
Continue - CONTINUE
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CONTINUE - Checking the contact reel's connector
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Checking the contact reel's connector
- Ignition off.
- Disconnect the connector from the contact reel.
- Check the cable terminals in the female and male sections of the connector.
Caution! The cable terminals must not be damaged or pressed back.
- Connect the connector to the contact reel. Check that the connector's sleeve section and pin section engage each other.
1. The connector's sleeve section and pin section are OK.
2. The connector's pin section is damaged.
3. The connector's sleeve section is damaged.
Select one of the above options.
1 - Checking DTCs with the contact reel's connector connected
2 - Replacing a component
3 - Replacing a component
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Replacing a component
- Replace contact reel according to: Steering wheel module, steering wheel and contact reel, replacement Airbag Steering Wheel Module, Steering Wheel and Contact Reel Replacement
Continue - FAULT FOUND
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Replacing a component
- Replace SRS cable harness.
Continue - FAULT FOUND
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Checking DTCs with the contact reel's connector connected
- Ignition on.
- Connect the battery's negative lead.
Erase the diagnostic trouble code (DTC).
Continue - Checking DTCs with the contact reel's connector connected, continued
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Checking DTCs with the contact reel's connector connected, continued
- Ignition on.
Read off diagnostic trouble code (DTC).
Can DTC SRS-212 be erased?
Yes - Replacing a component
No - Checking the contact reel's resistance
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Replacing a component
The SRS on-board diagnostic (OBD) system has not detected a fault with the ignition cable connector to the contact reel installed.
The fault is intermittent in the contact reel.
- Replace contact reel according to: Steering wheel module, steering wheel and contact reel, replacement Airbag Steering Wheel Module, Steering Wheel and Contact Reel Replacement
Continue - FAULT FOUND
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Checking the contact reel's resistance
- Ignition off.
- Disconnect the battery negative lead.
- Remove special tool: 998 8695 TEST DEVICE 998 8695 Test Device
- Disconnect the connector from the contact reel.
Connect an ohmmeter between terminal 1 on the part of the connector that is on the contact reel (image A in the image above) and terminal 1 on the ignition connector (left terminal pin, nearest the service hole). See connection in figure The ohmmeter shall show approx. 0 ohms.
Note! If the ohmmeter test pins are too large to fit in the connector's terminal hole, install a narrow metal pin (or a stripped piece of cable) max. diameter 1 mm. Measure against the metal pin or the piece of cable with the test pin. Do not damage the connector's cable terminal.
Connect an ohmmeter between terminal 2 on the part of the connector that is on the contact reel and the service hole on the ignition connector. See connection in figure The ohmmeter must read approximately 0 ohms.
Even if the ohmmeter reading is OK, there may still be an intermittent fault in the contact reel. Repeat resistance measurement and at the same time turn the steering wheel to full lock in both directions.
The ohmmeter must show 0 ohms in all steering wheel positions at both readings.
Is the value OK?
OK - Measurement instrument selection
Checking the capacitor, integrated in the ignition connector, resistance measuring.
Not OK - Replacing a component
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Replacing a component
If the ohmmeter shows an infinitely large value in any of the steering wheel positions, there is an open-circuit in the contact reel.
- Replace contact reel according to: Steering wheel module, steering wheel and contact reel, replacement Airbag Steering Wheel Module, Steering Wheel and Contact Reel Replacement
Continue - FAULT FOUND
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Checking the capacitor, integrated in the ignition connector, resistance measuring.
- Ignition off.
- Connect the measuring instrument's test probes between the connector's service hole and terminal 2, right-hand terminal pin. See connection in figure The capacitor charges.
The ohmmeter reading should rise rapidly to infinity.
- Reverse the position of the ohmmeter positive and negative test probes. Connect them to the connector as in the previous measurement. See connection in figure The capacitor discharges and recharges.
The ohmmeter reading must drop rapidly to approximately 0 ohms and then increase to infinity.
Is the value OK?
Yes - Checking resistance in the igniter cable and sensor module
No - Replacing a component
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Checking the capacitor, integrated in the ignition connector, capacitance measuring.
- A measuring instrument with a capacitance measuring facility can be used to check the integrated capacitor in the ignition cable ignition connector.
- Ignition off.
- Connect the measuring instrument's test probes between the connector's service hole and terminal 2, right-hand terminal pin. See connection in figure The read off value must be between 0.46 microF and 0.48 microF.
Is the value OK?
Yes - Checking resistance in the igniter cable and sensor module
No - Replacing a component
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Replacing a component
If the ohmmeter shows a constantly high value and does not drop or rise, there is an open-circuit in the capacitor.
- Replace contact reel according to: Steering wheel module, steering wheel and contact reel, replacement Airbag Steering Wheel Module, Steering Wheel and Contact Reel Replacement
Select continue when the defect has been remedied.
Continue - FAULT FOUND
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Checking resistance in the igniter cable and sensor module
- Ignition off.
Connect an ohmmeter between the connector sleeves in the part of the connector (part B in image) that goes to the SRS sensor module.
Caution! Do not damage the connector sleeves.
The ohmmeter should read approx. 47 kohms.
Is the value OK?
OK - Replacing a component
Not OK - Checking the SRS sensor module connector
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Replacing a component
The igniter cable and the sensor unit are OK.
- Replace contact reel according to: Steering wheel module, steering wheel and contact reel, replacement Airbag Steering Wheel Module, Steering Wheel and Contact Reel Replacement
Continue - FAULT FOUND
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Checking the SRS sensor module connector
- Ignition off.
- Expose and remove the SRS sensor module connector according to:
Caution! Never touch the sensor unit's terminal pins. There is a risk of static discharge which can damage the sensor module.
- Check the cable terminals in the female and male sections of the connector.
Caution! The cable terminals must not be damaged or pressed back.
- Install and remove the connector from the sensor module. Check that the connector locks securely in the sensor module.
1. The connector's sleeve section and pin section are OK.
2. The connector's pin section is damaged.
3. The connector's sleeve section is damaged.
Select one of the above options.
1 - Checking SRS ignition cable resistance
2 - Replacing a component
3 - Replacing a component
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Replacing a component
- Replace the sensor unit according to:
Continue - FAULT FOUND
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Replacing a component
- Replace SRS cable harness.
Continue - FAULT FOUND
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Checking SRS ignition cable resistance
- Ignition off.
Caution! Never touch the sensor unit's terminal pins. There is a risk of static discharge which can damage the sensor module.
Connect an ohmmeter between the sensor module's connector, terminal 10, and the ignition cable's connector, terminal 1.
The ohmmeter shall show approx. 0 ohms.
Note! If the ohmmeter test probes are too large to fit in the sensor module's disconnected connector, install a narrow metal pin (or a stripped piece of cable) max. diameter 1 mm. Measure against the metal pin or the piece of cable with the test pin. Do not damage the connector's cable terminal.
Connect an ohmmeter between the sensor module's connector, terminal 11, and the ignition cable's connector, terminal 2.
The ohmmeter shall show approx. 0 ohms.
Are these values OK?
OK - Replacing a component
Not OK - Replacing a component
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Replacing a component
Ignition cables OK.
- Replace the sensor unit according to:
Continue - FAULT FOUND
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Replacing a component
If the ohmmeter shows indefinite resistance at one of the readings, there is an open-circuit in the ignition cable between the connector and the sensor module's connector.
- Replace SRS cable harness.
Continue - FAULT FOUND
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