SRS-211
Diagnostic Trouble Code (DTC) SRS-211 - Driver's Airbag, short-circuit or capacitance too highSpecial tools:
- 998 8695
- Volvo Scan Tool (ST)
DTC Conditions
If resistance in the circuit is too low or capacitance too high for over 10 seconds, the diagnostic trouble code (DTC) SRS-211 is stored.
Cause of fault
Resistance too low.
- Short-circuit in the SRS ignition cable or connectors between steering wheel module and SRS sensor module.
- Short-circuit in steering wheel module (resistance too low in igniter).
- Short-circuit in contact reel.
Capacitance too high.
- Capacitance too high or short-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 steering wheel module will not work if this diagnostic trouble code (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 steering wheel module. This could deploy the airbag.
NOTE: Follow the operations in the 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). Displaying & Reading 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-211 if the fault is permanent.
If diagnostic trouble code (DTC) SRS-211 could not be cleared (the fault persists):
The fault is permanent.
- Continue with CE2.
If diagnostic trouble code (DTC) SRS-211 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 and turning the steering wheel while taking readings.
NOTE: If no fault has been isolated by the end of the fault tracing process start by replacing the contact reel.
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 EB2.
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.
NOTE: Put the steering wheel module with its metal side (back) down in a protected place (in the cargo compartment for example).
- Continue with CE3.
Checking diagnostic trouble codes (DTC) with steering wheel 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 in accordance with BC.
- 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-211 if the fault is in the steering wheel module.
If diagnostic trouble code (DTC) SRS-211 could be cleared:
No fault detected by the SRS on-board diagnostic (OBD) system with the steering wheel module removed and replaced by special tool 9988695.
The fault is probably in the steering wheel module. One last check should be made before replacing the steering wheel module.
- Continue with CE4.
If diagnostic trouble code (DTC) SRS-211 could not be cleared (the fault persists):
The fault persists even with the steering wheel module removed. This means that the steering wheel module is OK.
The fault is probably in the contact reel or SRS ignition cable.
- Continue with CE7.
Installing steering wheel module
- Ignition off.
- Disconnect battery negative lead.
- Remove special tool 9988695.
- Connect connector to steering wheel module.
- Install 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
Checking diagnostic trouble code (DTC) with the steering wheel module installed
- Switch ignition to position II.
- Connect battery negative lead,
- Read off diagnostic trouble code (DTC).
If the fault is in the steering wheel module diagnostic trouble code (DTC) SRS-211 should be stored.
If diagnostic trouble code (DTC) SRS-211 is present:
There is a short-circuit in the steering wheel module.
^ Replace steering wheel module in accordance with EB18, EB19 and EB20.
If no diagnostic trouble code (DTC) is present:
The SRS on-board diagnostic (OBD) system has not detected a fault with the steering wheel module installed.
The fault is intermittent in the contact reel or SRS ignition cable.
Removing steering wheel module
- Ignition off.
- Disconnect battery negative lead.
- Remove 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
NOTE: Put the steering wheel module with its metal side (back) down in a protected place (in the cargo compartment for example).
- Install special tool 9988695.
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.
Checking resistance in contact reel
- Ignition off.
- Disconnect contact reel connector.
- Connect an ohmmeter between the terminal pins in the contact reel halt of the connector (part A in the figure).
Take care not to damage connector pins.
The ohmmeter should read infinite resistance.
Even if the ohmmeter reading is OK there may be an intermittent fault in the contact reel.
- Repeat resistance measurements while slowly turning the steering wheel to full lock in both directions.
The ohmmeter should read infinite resistance.
If all readings are OK:
The fault is probably in the SRS ignition cable from the sensor module connector or capacitance is too high in the capacitor in the SRS ignition cable igniter connector.
- Continue with CE9.
If the reading is abnormal:
If the ohmmeter reads approx. 0 Ohms there is a short-circuit in the contact reel.
If the ohmmeter reads approx. 2-3 Ohms there is a short-circuit in the capacitor in the SRS ignition cable igniter connector.
^ Replace contact reel.
Checking resistance in the ignition cabling and sensor module
- Ignition off.
- Connect an ohmmeter between the connecting sockets in the sensor module half of the connector (part B in the figure).
Take care not to damage connecting sockets.
The ohmmeter should read approx. 47 Kohms.
If the reading is OK:
SRS ignition cabling and sensor module are OK.
^ Replace contact reel.
If the reading is abnormal:
If the ohmmeter reads approx. 0 Ohms there is a short-circuit in the SRS ignition cable between the connector and sensor module or there is a short-circuit in the sensor module.
Checking SRS ignition cable resistance
- 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.
- Connect an ohmmeter between the connecting sockets in the sensor module half of the connector (part B in the figure).
- Take care not to damage connecting sockets
The ohmmeter should read infinite resistance.
If the reading is OK:
The SRS ignition cable is OK.
^ Replace sensor module.
If the reading is abnormal:
If the ohmmeter reads approx. 0 Ohms there is a short-circuit in the SRS ignition cable between the connector and sensor module.
^ Replace SRS cable harness.