DESCRIPTION
The automatic light control sensor is installed on the upper side of the instrument panel. It detects sunlight to control air conditioning AUTO mode. The output voltage from the automatic light control sensor varies in accordance with the amount of sunlight. When the sunlight increases, the output voltage increases. As the sunlight decreases, the output voltage decreases. The air conditioning amplifier assembly detects changes in the output voltage from the automatic light control sensor.
DTC Code | DTC Detection Condition | Trouble Area |
---|---|---|
B14A2 | Short in driver side automatic light control sensor circuit |
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WIRING DIAGRAM
INSPECTION PROCEDURE
Note
When the auxiliary battery is disconnected or the air conditioning amplifier assembly is replaced, be sure to perform servo motor initialization Click here.
If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.
Before disconnecting the cable form the negative (-) battery terminal or replacing the air conditioning amplifier assembly, record the last operation state of the air conditioning for each transmitter. After replacement, it is necessary to perform memory registration for each transmitter Click here.
PROCEDURE
READ VALUE USING GTS (SOLAR SENSOR [D SIDE])
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Enter the following menus: Body Electrical / Air Conditioner / Data List Click here.
Check the value(s) by referring to the table below.
Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
---|---|---|---|
Solar Sensor (D Side) | Driver side automatic light control sensor / Min.: 0, Max.: 255 |
Driver side automatic light control sensor value increases as brightness increases | - |
OK |
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The display is as specified in the Normal Condition column. |
Result | Proceed to |
---|---|
NG | A |
OK (When troubleshooting according to Problem Symptoms Table) | B |
OK (When troubleshooting according to the DTC) | C |
B |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here |
C |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here |
A |
CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
*a | Front view of wire harness connector (to Automatic Light Control Sensor) |
Disconnect the automatic light control sensor connector.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | |||||||||
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NG |
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - AUTOMATIC LIGHT CONTROL SENSOR) Click here |
OK |
CHECK HARNESS AND CONNECTOR (AUTOMATIC LIGHT CONTROL SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)
Disconnect the N157 air conditioning amplifier assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
|||||||||
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
INSPECT SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR)
Inspect the automatic light control sensor. Refer to on-vehicle inspection procedure Click here.
NG |
REPLACE AUTOMATIC LIGHT CONTROL SENSOR Click here |
OK |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - AUTOMATIC LIGHT CONTROL SENSOR)
Disconnect the N12 main body ECU (multiplex network body ECU) connector.
Disconnect the O1 automatic light control sensor connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here