Last Modified: 4-30-2014 6.6 C Doc ID: RM0000018MX001X agn Model Year: 2006 Model: LX470 Prod Date Range: [05/2005 - ] Title: AIR CONDITIONING: AIR CONDITIONING SYSTEM: 12; Ambient Temperature Sensor Circuit; 2006 MY LX470 [05/2005 - ] DTC 12 Ambient Temperature Sensor Circuit DESCRIPTION This sensor detects the ambient temperature and sends the appropriate signals to the A/C amplifier. DTC NO. DETECTION ITEM TROUBLE AREA 12 Open or short in ambient temperature sensor circuit Ambient temperature sensor Harness or connector between ambient temperature sensor and A/C amplifier A/C amplifier WIRING DIAGRAM INSPECTION PROCEDURE PROCEDURE 1.
CHECK AIR CONDITIONING AMPLIFIER (a) Remove the A/C amplifier with the connectors still connected. (b) Turn the ignition switch ON. (c) Measure the voltage between terminals TAM (A48-7) and FRSG (A48-18) of the A/C amplifier connector at each temperature. Standard voltage: 1.35 to 1.75 V at 25 °C (77°F) 0.85 to 1.25 V at 40 °C (104°F) HINT: As the temperature increases, the voltage decreases. However, if DTC 12 is displayed, check and replace the A/C amplifier. OK REPLACE AIR CONDITIONING AMPLIFIER NG cardi REPLACE AIR CONDITIONING AMPLIFIER