Checking the relay
Check that the relay is securely connected and for contact resistance and oxidation according to Contact resistance and oxidation and the relay for loose connections according to Loose connections (terminals) .
The following applies only in the event of an open-circuit in the cable:
HINT: The fault may have caused by contact resistance, oxidation or loose connections in the supply to the relay. The voltage must be 12 V at both terminals #1 and #5 for relay 2/91. The voltage must be 12 V at terminal #1 for relay 2/90. Check fuse 11B/13 in the integrated relay/fusebox in the engine compartment in particular.
Using the table below, check the cable between the central electronic module (CEM) and the windshield wiper relay for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults and for contact resistance and oxidation according to Contact resistance and oxidation .
| Diagnostic Trouble Code (DTC) | Control module | Relay |
| CEM-8F23 | #13A | #2 (2/91) |
| CEM-8F26 | #14A | #2 (2/90) |
Check the connector for contact resistance and oxidation according to Contact resistance and oxidation and for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults .
Other information:
- To access the windshield wiper relay, see Integrated relay/fusebox, engine compartment, replacing .
- For information about the central electronic module (CEM) connector and to replace the relay, see Central electronic module (CEM), replacing .
- To connect the breakout box, see Connecting the breakout box .
- -2004: Signal specification
- 2005-: Signal specification