Test U

PINPOINT TEST U: DTC B1358 - IGNITION SWITCH OR BLOWER ELECTRONICS CIRCUIT SHORT TO GROUND/DTC B2521 - TACH CIRCUIT FAILURE

Test U1:

Test U1-U3:

Test U4-U5:

Test U6-U7:

Test U7-U8:

Test U9-U10:

Test U11:

Normal Operation
The climate controlled seat module (CCSM) provides voltage on circuit 8-FA18 (WH/BK) and ground on circuit 31S-FA18 (BK/RD) to operate the climate controlled seat blower fan. The CCSM also supplies voltage on circuit 20S-FA18 (PK/OG) that is used by the climate controlled seat blower fan to provide a feedback voltage to the CCSM indicating climate controlled seat blower fan speed.

Possible Causes
- wiring, terminals, or connectors.
- CCSM.
- climate controlled seat blower fan.