Fault Code 1587

Fault code 1587

Driver's airbag ignition circuit (stage 2)

Diagnostic conditions
- Ignition on
- Internal function test on airbag triggering unit

Possible cause of fault
- Upper limit value exceeded (based on the resistance value of the driver's airbag unit and the wiring between the airbag triggering unit and the driver's airbag unit)
- Lower limit value not reached (based on the resistance value of the driver's airbag unit and the wiring between the airbag triggering unit and the driver's airbag unit)
- Short circuit to B+
- Short circuit to ground
- Contact unit between steering wheel and vehicle faulty
- Driver's airbag unit faulty
- Triggering unit for airbag faulty

Affected pins
- Airbag triggering unit: pin 35 and pin 36

Diagnosis/troubleshooting

DANGER:
Danger of injury through triggering of driver's airbag
- 9588 Never hang the Porsche System Tester II over the steering wheel.

WARNING:
Danger 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:
The wiring harness between the airbag triggering unit and the driver's airbag unit has a number of disconnection points, which must be considered immediately as possible causes of the fault. The following disconnection points must be checked for correct contacts, possible corrosion or damage with ignition switched off before actually replacing the airbag triggering unit:
- First disconnection point in front of angle spring (behind top steering column switch)
- Second disconnection point in centre of steering wheel
- Third disconnection point directly at driver's airbag unit (only inspect this visually - never disconnect plug.)

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

NOTE: When you connect the test tool 5056/C and then switch the ignition on and off, fault code 0588 is automatically detected for stage 1 because there is no airbag unit connected to the ignition circuit in stage 1. This fault code must also be deleted after the fault is repaired and should no longer occur when you switch the ignition on and off again. Otherwise, this fault code must be handled according to instructions.

169 Additional airbag tester, Porsche set