Test S: DTC B1358 - Ignition Switch Or Blower Electronics Circuit Short To Ground/DTC B2521 - Tach Circuit Failure

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

S1:

S1-S3:

S4-S5:

S6-S7:

S7-S8:

S8-S9:

S10-S11:

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
A blower electronics short to ground or tach circuit failure can be caused by:
- a fuse.
- wiring, terminals or connectors.
- CCSM.
- climate controlled seat blower fan.