Test E: DTC B1681 - PATS Transceiver Module Signal Is Not Received

PINPOINT TEST E: DTC B1681 - PATS TRANSCEIVER MODULE SIGNAL IS NOT RECEIVED

E1-E2:

E2-E4:

E4-E6:

E6-E8:

E8-E10:

E10-E12:

Normal Operation
The passive anti-theft system (PATS) transceiver receives voltage from the smart junction box (SJB) on circuit CBP18 (GY/OG) and is grounded on circuit GD116 (BK/VT). The PATS transceiver and the instrument cluster communicate on the TX and RX circuits VRT23 (VT/GY) and VRT24 (YE/OG). The instrument cluster compares the key code stored in memory and sends a message to the PCM to enable the starter and fuel injectors if the key code is correct.

DTC B1681 - sets when the PATS transceiver signal is not received by the instrument cluster. This DTC can be caused by circuits between the PATS transceiver and the instrument cluster, or circuits to the PATS transceiver. This can also be caused by using the incorrect PATS transceiver part number.

Possible Causes
- Fuse
- Circuit GD116 (BK/VT) open
- Circuit VRT23 (VT/GY) open or short to voltage
- Circuit VRT24 (YE/OG) open or short to voltage
- Circuit CBP18 (GY/OG) open or short to ground
- PATS transceiver
- PCM