B1468
HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1468/68: Rear Passenger Side Room Temperature Sensor Circuit
B1468/68 - Rear Passenger Side Room Temperature Sensor Circuit
DESCRIPTION
The rear room temperature sensor RH is installed in the rear quarter trim board RH to detect the rear room temperature and control the heater and air conditioner auto mode. The resistance of the rear room temperature sensor RH changes in accordance with the rear room temperature for RH seat. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.
The air conditioning amplifier assembly applies a voltage (5 V) to the rear room temperature sensor RH and reads voltage changes as changes in the resistance of the rear room temperature sensor RH.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. READ VALUE USING TECHSTREAM (REAR ROOM TEMPERATURE SENSOR RH)
(a) Use the Data List to check if the rear room temperature sensor RH is functioning properly.
Air Conditioner
OK:
The display is as specified in the normal condition.
NG -- INSPECT REAR ROOM TEMPERATURE SENSOR RH
OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal
2. INSPECT REAR ROOM TEMPERATURE SENSOR RH
(a) Remove the rear room temperature sensor RH Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NOTICE:
Even slightly touching the sensor may change the resistance value. Be sure to hold the connector of the sensor.
HINT
As the temperature increases, the resistance decreases (See the graph).
NG -- REPLACE REAR ROOM TEMPERATURE SENSOR RH Removal
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (REAR ROOM TEMPERATURE SENSOR RH - AIR CONDITIONING AMPLIFIER)
(a) Disconnect the z37 sensor connector.
(b) Disconnect the E35 amplifier connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal