Fault Code 0654

Fault code 0654

Belt tensioner ignition circuit, front driver's side

Conditions for diagnosis
- Ignition on
- Internal function test on airbag trigger unit

Possible cause of fault
- Upper limit exceeded (based on resistance of wiring between airbag trigger unit and belt tensioner or belt tensioner itself)
- Lower limit not reached (based on resistance of wiring between airbag trigger unit and belt tensioner or belt tensioner itself)
- Short circuit to positive (with respect to wiring from Pins 61 and 62 of airbag trigger unit and belt tensioner on front driver's side)
- Short circuit to ground (with respect to wiring from Pins 61 and 62 of airbag trigger unit and belt tensioner on front driver's side)
- Front driver-side belt tensioner faulty
- Airbag trigger unit faulty

Affected pins
- Airbag trigger unit: Pin 61 and Pin 62
- Belt tensioner plug connection, front driver's side: Pin 1 and Pin 2

Diagnosis/troubleshooting

WARNING:
Risk of injury if vehicle is driven with special tools in place (commercially available tools included).
- Never drive with special tools or commercially available tools attached instead of the airbag units.

NOTE: Never disconnect plugs which are connected directly to airbag modules and belt tensioners because these have been connected with a defined contact pressure to prevent the plug from working loose in order to prevent malfunction during the life of the vehicle. The plug connections (mostly 3-pin) which are intended for this purpose must be disconnected using an integrated short circuit bridge.

Additional airbag tester, Porsche set No 169