Test U: DTC B1358 - Ignition Switch or Blower Electronics Circuit Short to Ground/DTC B2521 - Tach Circuit Failure

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

U1:

U1-U2:

U3-U5:

U6-U7:

U7-U8:

U8-U9:

U10-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.