DTC B3A01-12: A/C Evaporator Front Magnetic Valve Circuit Short to Battery [12/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 550h+. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS AND CONNECTOR (EVAPORATOR FRONT MAGNETIC VALVE (NO. 2 MAGNET VALVE ASSEMBLY) - AIR CONDITIONING AMPLIFIER ASSEMBLY)

Pre-procedure1

Disconnect the B91 evaporator front magnetic valve (No. 2 magnet valve assembly) connector.
Disconnect the D36 air conditioning amplifier assembly connector.

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Condition	Specified Condition	Result
B91-2 (VC) or D36-6 (EVMV) - Body ground	Always	Below 1 V	V

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition	Result
B91-2 (VC) or D36-6 (EVMV) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

Result

Proceed to
OK
NG

Post-procedure1

None

Result:

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to REMOVAL [09/2023 - ]

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR