Troubleshooting procedure
Specific troubleshooting can only be performed in accordance with instructions (given under Diagnosis/troubleshooting for each fault code) if the entry has the status 'present' in the fault memory.
If the fault is currently 'not present', please check the following
- Diagnostic conditions are met
- All plug connections and ground points of the affected current path are OK
- Set all wiring harnesses of the affected current path to a state that corresponds to driving by pulling and shaking them.
Diagnostic conditions
| IMPORTANT | Always connect a suitable battery charging device to the vehicle electrical system battery before starting diagnosis. All unnecessary loads must also be switched off. |
Note. The fault can only be identified if the requirements listed under 'Diagnostic conditions' are met. For this reason, the specified procedure must be observed after a fault is repaired
- Erase fault memory
- Satisfy the requirements listed under 'Diagnostic conditions'.
- Read out fault memory again.
Diagnosis/troubleshooting
Note. The fault memory Info key [F8] on the Porsche System Tester II No. 9588 can be used to access the 'extended fault memory'. The following information can be displayed
Troubleshooting with no control module connected
The following text is displayed in the Porsche System Tester II No. 9588
Communication problem with the control module.
- Restore connection by pressing
- Abort with ESC
Note. The wiper motor control module is not connected directly to the diagnostic socket (16-pin, driver's footwell). Communication between the wiper motor control module and the Porsche System Tester II No. 9588 only takes place indirectly via 'CAN Infotainment'=> 'Gateway'=> 'K lead'.
- Ignition on
- Battery voltage is OK
- The Porsche System Tester II No. 9588 is functional.
Note. The function of the Porsche System Tester II No. 9588 and the diagnosis lead No. 9588/5 can be checked on another vehicle!
| Work instruction | Display OK | If not OK | ||
|---|---|---|---|---|
| 1 | Check communication with the gateway | Select the gateway control module in the Porsche System Tester II No. 9588 | Communication is established Go to Step 2 | Continue troubleshooting, refer to GATEWAY . |
| 2 | Check fuse | Wiper motor control module Check fuse, 'terminal 30'. (Fuse carrier at left of dashboard, F8) | Go to Step 3 | Replace fuse and remedy the cause, if necessary --> End |
| 3 | Check power supply, 'terminal 30' | Switch off ignition Pull off wiper motor plug Check voltage between pins 1 and 2 of wiper motor plug | 11.4 to 14.5V Go to Step 4 | Repair line --> End |
| 4 | CAN Infotainment, check connection to 'wiper motor control module' | Follow CHECKING INSTRUCTIONS/CAN DATA BUS . | If CAN check is OK: Go to Step 5 | |
| 5 | Replace wiper motor | > End | ||
DIAGNOSIS TROUBLESHOOTING PROCEDURE
- Ignition on
- Internal function test
Note. The control module and the wiper motor form one unit. The entire unit must be replaced in the event of a fault.
| Work instruction | Display OK | If not OK | |
|---|---|---|---|
| 1 | Replace wiper motor (with control module) in accordance with repair instructions | > End | |
DIAGNOSIS TROUBLESHOOTING PROCEDURE
- Ignition on
- Windscreen wiper on
- Internal wiper motor control module function test
| Work instruction | Display OK | If not OK | ||
|---|---|---|---|---|
| 1 | Check that the wiper mechanism is not blocked | Visual inspection and function test Switch off ignition Raise wiper arms slightly and move along the wiper angle by moving the passenger's wiper arm | Go to Erase fault memory | > Step 2 |
| 2 | Check that the wiper link is not blocked and moves freely | Loosen wiper motor on the input shaft Check that the wiper link is not blocked and moves freely | Go to Erase fault memory | > Step 3 |
| 3 | Replace wiper link according to instructions | > End | ||
DIAGNOSIS TROUBLESHOOTING PROCEDURE
- Ignition on
Note. If there is no incoming signal via CAN comfort using several control modules, CAN comfort must be checked for open or short circuits. Refer to ' CHECKING INSTRUCTIONS/CAN DATA BUS '
| Work instruction | Display OK | If not OK | |
|---|---|---|---|
| 1 | Read out fault memory in KESSY control module | Faults present Go to Correct the faults | Go to Step 2 |
| 2 | Read out fault memory in gateway control module | Faults present Go to Correct the faults | Go to Step 3 |
| 3 | Continue troubleshooting, Refer to CHECKING INSTRUCTIONS/CAN DATA BUS . | > End | |
DIAGNOSIS TROUBLESHOOTING PROCEDURE
- Ignition on
- Internal wiper motor control module function test
| Work instruction | Display OK | If not OK | |
|---|---|---|---|
| 1 | Read out fault memory in steering column switch control module | Faults present Go to Correct the faults | Go to Step 2 |
| 2 | Read out fault memory in gateway control module | Faults present Go to Correct the faults | Go to Step 3 |
| 3 | Continue troubleshooting, Refer to CHECKING INSTRUCTIONS/CAN DATA BUS . | > End | |
DIAGNOSIS TROUBLESHOOTING PROCEDURE
- Ignition on
- Internal wiper motor control module function test
| Work instruction | Display OK | If not OK | ||
|---|---|---|---|---|
| 1 | Check coding | Connect the Porsche System Tester II No. 9588 and switch on the ignition. Read out coding using the Tester in accordance with the vehicle equipment with or without automatic light switch function (see Control module function (coding/programming) ). | Go to Step 2 | Code the control module (wiper motor) in accordance with the vehicle equipment (see Control module function (coding/programming) ) --> End |
| 2 | Check windscreen/ rain sensor assignment | Look for the part number of the rain sensor (on component) Determine the windscreen type (heat insulation glass or insulating glass) Check assignment in accordance with Spare Parts Catalogue "PET" | Go to Step 3 | Install suitable rain sensor/ light sensor --> End |
| 3 | Check windscreen and silicone cushion for faults and soiling | Carry out a visual inspection to see if there are any cracks, chips or soiling on the windscreen or on the silicone cushion in the area of the rain/light sensor | Go to Step 4 | Repair damage or clean any soiling --> End |
| 4 | Check the power supply of the rain sensor/light sensor | Check voltage between pin 1 and pin 2 of rain/light sensor plug | Voltage is 11.4 to 14.5V Go to Step 5 | Establish power supply: repair line or replace wiring harness --> End |
| 5 | Replace rain sensor | > End | ||
DIAGNOSIS TROUBLESHOOTING PROCEDURE
- Ignition switched on
- Internal wiper motor control module function test
Note. If there is no incoming signal via CAN Infotainment using several control modules, CAN Infotainment must be checked for open or short circuits. Refer to ' CHECKING INSTRUCTIONS/CAN DATA BUS '.
| Work instruction | Display OK | If not OK | |
|---|---|---|---|
| 1 | Check fault memory in gateway for faults | Further faults present Go to Correct the faults | Go to Step 2 |
| 2 | Continue troubleshooting, Refer to CHECKING INSTRUCTIONS/CAN DATA BUS . | CAN, fault localization in accordance with checking instructions --> End | |
DIAGNOSIS TROUBLESHOOTING PROCEDURE
- Ignition on
- Internal wiper motor control module function test
Note. If there is no incoming signal via CAN Infotainment using several control modules, CAN Infotainment must be checked for open or short circuits. Refer to ' CHECKING INSTRUCTIONS/CAN DATA BUS '.
| Work instruction | Display OK | If not OK | |
|---|---|---|---|
| 1 | Continue troubleshooting, Refer to CHECKING INSTRUCTIONS/CAN DATA BUS . | CAN, fault localization in accordance with checking instructions --> End | |
DIAGNOSIS TROUBLESHOOTING PROCEDURE
- Ignition on
- Internal wiper motor control module function test
| Work instruction | Display OK | If not OK | ||
|---|---|---|---|---|
| 1 | Check coding in wiper motor control module and vehicle electrical system control module, and change if necessary | Select the required coding under menu item Coding using the Porsche System Tester II No. 9588 | Go to Step 2 | Code vehicle electrical system and wiper system control module correctly. With or without driving light assistant and rain/light sensor --> End |
| 2 | Check the power supply of the rain sensor/light sensor | Check voltage between pins 1 and 2 of rain/light sensor plug | Voltage is 11.4 to 14.5 V Go to Step 3 | Repair wire or replace wiring harness --> End |
| 3 | Check windscreen and silicone cushion for faults and soiling | Carry out a visual inspection to see if there are any cracks, chips or soiling on the windscreen or on the silicone cushion in the area of the rain/light sensor | Go to Step 4 | Repair damage or clean any soiling --> End |
| 4 | Check signal lead for short circuit to B+ | Switch off ignition Pull off/disconnect wiper motor plug Pull off/disconnect rain sensor plug Switch on ignition Measure voltage between pin 5 of wiper motor plug and ground | < 0.3V Go to Step 5 | Repair wire or replace wiring harness --> End |
| 5 | Check signal lead for short circuit to ground | Measure resistance between pin 5 of wiper motor plug and ground | Infinity ohms Go to Step 6 | Repair wire or replace wiring harness --> End |
| 6 | Check signal lead for open circuit | Measure resistance between pin 5 of wiper motor plug and pin 3 of rain/light sensor | < 5 ohms Go to Step 7 | Repair wire or replace wiring harness --> End |
| 7 | Replace rain sensor/light sensor | > End | ||
DIAGNOSIS TROUBLESHOOTING PROCEDURE
Poses Online