Pinpoint Test BS : DTC B2730: Notes

Refer to Climate Controlled Seats for schematic and connector information.

Normal Operation 

The Passenger Climate Controlled Seat Module - 2 (PCSM-2) monitors the temperature sensor. If the temperature exceeds the specified limits, the DTC will be set.

The presence of overtemperature faults (DTCs B2729, B2730, B272A and B272B) can be induced by incorrect operation of the climate controlled seat system after an initial heat setting has been attained. If a heat setting is repeatedly turned OFF and ON in an attempt to increase the seat temperature or repeatedly toggled between heat and cool modes, an overtemperature condition can result and the DTCs will be set.

• DTC B2730 (Back Over-Temp Detected) (Driver) - For heat mode, if the driver seat backrest TED temperature exceeds 110 °C (230 °F) continuously for more than 4 seconds in any heat mode, the DCSM turns off the TED and enters a fan only state to recover from the over-temperature condition (recovery mode). If the TED temperature does not recover after 30 seconds, the DTC will set and the seat is disabled. If the TED does recover, the TED is re-enabled, the system continues to operate normally and the DTC will not be set. If the over-temperature condition occurs a second time within the same ignition cycle, the DTC will set and the seat is disabled.
• DTC B2730 (Back Over-Temp Detected) (Driver) - For cool mode, if the driver seat backrest TED temperature exceeds 65 °C (149 °F) continuously for more than 4 seconds in any cool mode, the DCSM turns off the TED and enters a fan only state to recover from the over-temperature condition (recovery mode). If the TED temperature does not recover after 5 minutes, the DTC will set and the seat is disabled. If the TED does recover, the TED is re-enabled, the system continues to operate normally and the DTC will not be set. If the over-temperature condition occurs a second time within the same ignition cycle, the DTC will set and the seat is disabled.

This pinpoint test is intended to diagnose the following: 

• Wiring, terminals or connectors
• Restricted backrest TED filter
• Crushed or restricted backrest foam pad
• Backrest TED assembly
• PCSM-2