Airbag diagnostics - Rover
On some models, no serial diagnostics are available with the airbag system. On these
systems, faults are reported by means of the Airbag warning light on the dashboard. The
Rover models concerned are as follows:
· Metro
· Rover 100
· New Rover 400
· Rover 600
ED3 Airbag
For the ED3 system on Metro, Rover 100, and New Rover 400 vehicles, the airbag warning
light has the following meaning.
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Warning light behavior when ignition is switched on.
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Meaning
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| Comes on then goes off after 3 seconds. | No fault in system |
| Comes on and stays on | Fault in airbag module, SRS ECU, cabling, or airbag module connector |
| Comes on, goes off after 3 seconds, then comes back on and remains on. | Fault in airbag module, SRS ECU, cabling, or airbag module connector |
| Does not come on at all | Fault with SRS Fuse, Rotary coupler, Airbag module, SRS ECU, or main wiring harness |
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EC3 Airbag
For the EC3 system on New Rover 400, the airbag warning light has the following meaning.
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Warning light behavior when ignition is switched on.
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Meaning
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Comes on then goes off after 3 seconds.
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No fault in system
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Comes on and stays on
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Fault with SRS ECU, connector or harness
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Gives a single flash
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Fault in drivers airbag circuit
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Gives a double flash
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Fault in passengers airbag circuit
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Gives a triple flash
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Leak in airbag circuits
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Does not come on at all
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Fault with : Warning lamp, supply to instrument pack, SRS harness, SRS ECU
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Honda SRS Type III
For the Honda SRS system used on Rover 600 and New Rover 400, the airbag warning light
has the following meaning.
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Warning light behavior when ignition is switched on.
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Meaning
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Comes on then goes off after about 6 seconds
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No fault in system
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Comes on and stays on
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Fault in airbag system. Refer to blink codes (See below)
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Comes on, goes off after about 6 seconds, Then comes back on and stays on
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Fault in airbag system. Refer to blink codes (See below)
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Comes on and stays on
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Fault in warning lamp circit
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If a fault is indicated on the Honda airbag system, a blink code readout can be obtained by
shorting the blue two-pin SCS diagnostic connector, which can be found under the glove
box in the passenger side. Do not confuse this with the blue three-pin connector.
Switch off the ignition.
With the pins shorted, switch on the ignition to position 3.
The SRS warning light will come on then after 6-30 seconds it will go out.
It will then indicate the stored blink codes. Each fault code has two digits. The first digit is represented by a series of one-second blinks.
The second digit is represented by a series of half-second blinks. There will be a two-second gap between each digit and also between each fault code.
The meaning of each blink code is described in the following table.
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Blink Code
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Meaning
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| 1-1 | High resistance in drivers airbag circuit |
| 1-3 | Low resistance in drivers airbag circuit |
| 1-4 | Short to supply in drivers airbag circuit |
| 1-5 | Short to ground in drivers airbag circuit |
| 2-1 | High resistance in passengers airbag circuit |
| 2-3 | Low resistance in passengers airbag circuit |
| 2-4 | Short to supply in passengers airbag circuit |
| 2-5 | Short to ground in passengers airbag circuit |
| 5-1 | ECU internal fault |
| 5-3 | ECU internal fault |
| 5-4 | ECU internal fault |
| 6-3 | ECU internal fault |
| 6-4 | ECU internal fault |
| 7-1 | ECU internal fault |
| 7-2 | ECU internal fault |
| 7-3 | ECU internal fault |
| 8-1 | ECU internal fault |
| 8-2 | ECU internal fault |
| 8-6 | ECU internal fault |
| 9-1 | Fault in SRS warning light circuit. |
| 9-2 | Fault in SRS power supply circuit. |
| 10-1 | ECU internal fault |
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For continuous failures, the blink codes will be repeated.
For intermittent failures, the blink codes are reported once only then the SRS light will stay on.
If there are no SRS faults to report, the light will remain on.
Once you have identified the fault, switch off the ignition and remove the bridge from the connector.
New Rover 400
On the New Rover 400 model, three different types of airbag system can be fitted. To
determine which type of airbag is in use, consult the following rules.
· 416 Auto 5 door with VIN up to 250028 uses Honda type III SRS
· All other models if fitted with drivers airbag only, use ED3
· All other models if fitted with drivers and passengers airbags use EC3
Procedure for resetting the SRS light on Rover 600 models
This is the procedure for resetting the SRS light on Rover 600 models with the SRS3 system fitted from mid-1994 onwards, in particular models with twin airbags.
Now the fault has been diagnosed the SRS light can be reset.
From the drivers side, reach under the the dashboard just below the steering column for a yellow two-pin connector.
Shortcut the pins in the yellow connector.
Switch on the ignition to position 3.
The SRS light will illuminate for six seconds. When it goes out remove the bridge within four seconds. The SRS light will come on again for another six seconds; reconnect the bridge. When the light goes out remove the bridge again within four seconds.
If you have done this correctly the SRS light will blink twice to confirm the reset. Repeat the above if there are no confirmation blinks. Switch off the ignition.
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