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Impact Sensor: Testing and Inspection


WM 695325 Eliminating symptoms in body interior: Re-programming airbag triggering unit (Warning light for seat belt in instrument cluster comes on/SY1110)

Tools





General information

Symptom

Warning light for seat belt in instrument cluster comes on even when the seat-belt buckle is fastened.

Cause, date of introduction and remedial action

Cause

With the previous data version of the airbag triggering unit, the seat belt warning light in the instrument cluster can come on even when the seat-belt buckle is fastened.

Date of introduction

Control units with the new data version are installed in the vehicle from 16.10.2009 onwards.

Remedial action

If a complaint is received in relation to a vehicle that was manufactured before the specified date of introduction:

- Read out the software data record of the airbag triggering unit and depending on this.
- Re-program the airbag triggering unit (PIWIS Tester test software version 27.000 is available as an online update from 06.04.2010).

If the fault still occurs after loading the new software data record, the fault must be found and corrected by running Guided Fault Finding using the PIWIS Tester.

Tools and materials

Tools





Materials

Seat-belt buckle

Preliminary work

NOTICE

Fault entry in the fault memory and control unit programming aborted due to undervoltage.

- Increased current draw during diagnosis or control unit programming can cause a drop in voltage, which can result in one or more fault entries and the abnormal termination of the programming process.

-> Before starting control unit programming, connect a suitable battery charger with a current rating of at least 40 A to the vehicle battery.

1. Connect the PIWIS Tester with installed test software version 27.000 (or higher) to the vehicle and switch on ignition.
2. Select Diagnostics => Vehicle.
3. Select control unit => 'POSIP' and confirm your selection by pressing >>.
4. Select menu item => 'Identification' and confirm by pressing >>.
5. Press >> to call up the 'extended identification'.
6. Select menu item => 'Crash parameter record identifier' and check the identifier.
If the identifier is 7F, 80, 81, 82 or 83, the data record is an old software data record and the airbag triggering unit must be re-programmed.
If the identifier is 8A, 8B, 84, 85, 86, 87, 88 or 89, the data record is a new software data record and Guided Fault Finding must be run in order to find the fault.
7. Press ESC to return to the => 'Control units' menu (list of control units).


Re-programming airbag triggering unit

1. Read out the fault memory and erase it.
1.1. Select 'Special functions' in the => 'Control units' menu and confirm by pressing >>.
1.2. Select 'Erase all fault memories' in the => 'Special functions function selection' menu and confirm by pressing >>.
The faults stored in the fault memories of the various control units are deleted.
If the fault memories of individual control units (e.g. POSIP) cannot be erased, switch the ignition off and then on again and erase the fault memories of these control units separately.
If the POSIP control unit is found to have faults, which cannot be erased, these faults must be found and corrected using Guided Fault Finding.
1.3. Once you have erased the fault memories, press (double arrows) to return to the => 'Control units' menu (list of control units).
2. Re-program the airbag triggering unit using the PIWIS Tester with test software version 27.000 (or higher) installed.
2.1. Select control unit => 'POSIP' and confirm your selection by pressing >>.

Information

If the locking procedure for the airbag triggering unit was interrupted (e.g. due to a voltage drop or if communication was aborted, etc.), the locking procedure must be repeated.

2.2. Select menu item => 'Lock' and confirm by pressing >>.
2.3. Read and follow the instructions on the PIWIS Tester.
Then press >> to continue.
2.4. Acknowledge the message => "Locking ECU" by pressing >>.
The message "Writing data record" will appear.
2.5. Confirm the message => 'Start locking' by pressing F8.
The message "Locking control unit" appears.
2.6. Press >> to acknowledge the message => "Control unit was locked successfully".
2.7. Read and follow the instructions on the PIWIS Tester.
Then check the coding values for the airbag triggering unit and correct them if necessary.
2.8. Press (double arrows) to return to the => 'POSIP control unit' menu.
3. Check the software data record of the airbag triggering unit again.
3.1. Select menu item => 'Identification' and confirm by pressing >>.
3.2. Press >> to call up the 'extended identification'.
3.3. Select menu item => 'Crash parameter record identifier' and check the identifier.
The identifiers 8A, 8B, 84, 85, 86, 87, 88 or 89 must be displayed for the new software data record.
4. Press ESC to return to the => 'Control units' menu (list of control units).
5. Switch ignition off and then on again.
6. Check that the seat belt warning light now goes off when the seat-belt buckle is fastened.
If the seat belt warning light still comes on, Guided Fault Finding must be run in order to find the fault.
Once you have corrected the fault, read out the fault memory again and then erase it.
7. Read out the fault memory and erase it.
7.1. Select 'Special functions' in the => 'Control units' menu and confirm by pressing >>.
7.2. Select 'Erase all fault memories' in the => 'Special functions function selection' menu and confirm by pressing >>.
The faults stored in the fault memories of the various control units are deleted.
If the fault memories of individual control units (e.g. DME) cannot be erased, switch the ignition off and then on again and erase the fault memories of these control units separately.
If other control units are found to have faults, which cannot be erased and are not caused by programming the airbag triggering unit, these faults must be located and corrected.
7.3. Once you have erased the fault memories, press (double arrows) to return to the => 'Control units' menu (list of control units).
8. Switch off the ignition and disconnect the PIWIS Tester from the vehicle.

End of remedial action.

Working time

69532500: Programming airbag triggering unit; Labor time 40 TU
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