Technical Air bag warning light
- Thread starter DaveMcT
- Start date
Currently reading:
Technical Air bag warning light
- Joined
- Sep 14, 2009
- Messages
- 19,899
- Points
- 3,413
Behind my glove compartment its stuffed with stuff and there's no point looking elsewhere until I get the clockspring connected.
Probably different from what you're dealing with WhiteSei but on the offchance, here's how a Mk2b that I fixed was wired up:
Top of clockspring had 4-way connector. Pair to airbag (Yellow and Yellow/White), pair to horn push (Green/Yellow and Black/Yellow).
Bottom of clockspring had 12-way connector. Horn on pins 7 and 8, airbag on pins 11 and 12. Didn't note which way round each pair was but horn wires were Black/Pink and Black. Airbag wires were Blue and Brown/White.
Airbag ECU had 24-pin connector.
1 Black/Violet, Gnd
2 Blue/Red, 12V supply from F50 (7.5A)
3 White/Green, signal from Body Computer
7 Pink/Green, passenger's airbag inhibit switch
9 Violet/Black, passenger's airbag inhibited lamp (via instr. panel B14)
10 Light blue/White, airbag fault lamp (via instr. panel B13)
21 Blue, driver's airbag
22 Brown/White, driver's airbag
23 White/Black, passenger's airbag
24 Orange/Black, passenger's airbag
The passenger airbag inhibit switch had Violet/Black and Orange/Green wires. Not sure where one of these joined the Pink/Green on ECU Pin 7. The other side of the switch goes to ground. Inside the switch are two surface mounted resistors. 100R across the switch when "ON" and 400R across the switch when "OFF". This allows the ECU to check that the switch is there and not just assume it's off if no ground detected.
Anyway, if the above doesn't help you, someone else may derive benefit one day. Final note: the wire colours that I found don't all match up with what Haynes says so probably best to trace continuity where possible.
red
Top of clockspring had 4-way connector. Pair to airbag (Yellow and Yellow/White), pair to horn push (Green/Yellow and Black/Yellow).
Bottom of clockspring had 12-way connector. Horn on pins 7 and 8, airbag on pins 11 and 12. Didn't note which way round each pair was but horn wires were Black/Pink and Black. Airbag wires were Blue and Brown/White.
Airbag ECU had 24-pin connector.
1 Black/Violet, Gnd
2 Blue/Red, 12V supply from F50 (7.5A)
3 White/Green, signal from Body Computer
7 Pink/Green, passenger's airbag inhibit switch
9 Violet/Black, passenger's airbag inhibited lamp (via instr. panel B14)
10 Light blue/White, airbag fault lamp (via instr. panel B13)
21 Blue, driver's airbag
22 Brown/White, driver's airbag
23 White/Black, passenger's airbag
24 Orange/Black, passenger's airbag
The passenger airbag inhibit switch had Violet/Black and Orange/Green wires. Not sure where one of these joined the Pink/Green on ECU Pin 7. The other side of the switch goes to ground. Inside the switch are two surface mounted resistors. 100R across the switch when "ON" and 400R across the switch when "OFF". This allows the ECU to check that the switch is there and not just assume it's off if no ground detected.
Anyway, if the above doesn't help you, someone else may derive benefit one day. Final note: the wire colours that I found don't all match up with what Haynes says so probably best to trace continuity where possible.
red
Last edited:
- Joined
- Sep 14, 2009
- Messages
- 19,899
- Points
- 3,413
Thanks Red. 
Ive saved it to a txt file for when I get a proper look at the car. My Mk2 clockspring had a separate 2 pin connector for the horn but very weak with really thin wires. The airbag connector got "lost"
Its a good bet they decided to change it to one connector, but also a good bet everything else is much the same.
Ive saved it to a txt file for when I get a proper look at the car. My Mk2 clockspring had a separate 2 pin connector for the horn but very weak with really thin wires. The airbag connector got "lost"
Its a good bet they decided to change it to one connector, but also a good bet everything else is much the same.
Last edited:
