Circuit Description

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

This sensor detects the position of the cool air bypass damper and sends the appropriate signals to the A/C ECU.

The position sensor is built into the cool air bypass damper control servomotor assembly.

Fig 1: Identifying TPB Terminal Voltage Graph

DETECTION ITEM

DTC No.	Detection Item	Trouble Area
B1434/34	Short to ground or to power source circuit in cool air bypass damper position sensor circuit.	Cool air bypass damper position sensor. Harness or connector between cool air bypass damper control servomotor assembly and A/C ECU. A/C ECU.