|

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.

Warning light behavior when ignition is switched on. Meaning
Comes on then goes off after 3 seconds.No fault in system
Comes on and stays onFault 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 allFault with SRS Fuse, Rotary coupler, Airbag module, SRS ECU, or main wiring harness


EC3 Airbag

For the EC3 system on New Rover 400, the airbag warning light has the following meaning.

Warning light behavior when ignition is switched on. Meaning
Comes on then goes off after 3 seconds. No fault in system
Comes on and stays on Fault with SRS ECU, connector or harness
Gives a single flash Fault in drivers airbag circuit
Gives a double flash Fault in passengers airbag circuit
Gives a triple flash Leak in airbag circuits
Does not come on at all Fault with : Warning lamp, supply to instrument pack, SRS harness, SRS ECU


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.

Warning light behavior when ignition is switched on. Meaning
Comes on then goes off after about 6 seconds No fault in system
Comes on and stays on Fault in airbag system. Refer to blink codes (See below)
Comes on, goes off after about 6 seconds, Then comes back on and stays on Fault in airbag system. Refer to blink codes (See below)
Comes on and stays on Fault in warning lamp circit

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.

Blink Code Meaning
1-1High resistance in drivers airbag circuit
1-3Low resistance in drivers airbag circuit
1-4Short to supply in drivers airbag circuit
1-5Short to ground in drivers airbag circuit
2-1High resistance in passengers airbag circuit
2-3Low resistance in passengers airbag circuit
2-4Short to supply in passengers airbag circuit
2-5Short to ground in passengers airbag circuit
5-1ECU internal fault
5-3ECU internal fault
5-4ECU internal fault
6-3ECU internal fault
6-4ECU internal fault
7-1ECU internal fault
7-2ECU internal fault
7-3ECU internal fault
8-1ECU internal fault
8-2ECU internal fault
8-6ECU internal fault
9-1Fault in SRS warning light circuit.
9-2Fault in SRS power supply circuit.
10-1ECU internal fault

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.


 

Jannik Munk     5250 Odense SV     J@nnik.biz