DTC B1422/22: Compressor Lock Sensor Circuit: Procedure

1. Use Techstream to check if the CAN communication system is functioning normally. Refer to HOW TO PROCEED WITH TROUBLESHOOTING .

   OK

   CAN DTC is not output.

NG → See step   5 

OK: Go to next step 

1. Remove the air conditioning amplifier with the connectors still connected. Refer to REMOVAL - Step 6 .
   Fig 1: Inspecting Air Conditioning Amplifier

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2. Measure the waveform of the connector.
   Fig 2: Identifying Connector Waveform

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Item	Contents
   Tool setting	200 mV/DIV., 10 ms./DIV.
   Vehicle condition	Engine is running A/C switch: ON Blower switch: LO

   Standard

   Tester Connection	Condition	Specified Condition
   D37-8 (LOCK) - D37-13 (SG-2)	Engine is running A/C switch: ON Blower switch: LO	Pulse generation

   Result

   Result	Proceed to
   NG	A
   OK (When troubleshooting according to PROBLEM SYMPTOMS TABLE)	B
   OK (When troubleshooting according to DTC)	C

B → See step   6 

C → See step   7 

A: Go to next step 

1. Disconnect the connector from the air conditioning compressor.
   Fig 3: Identifying Compressor And Magnetic Clutch (Air Conditioning Lock Sensor)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   B66-1 (SSR+) - B66-2 (SSR-)	20°C (68°F)	160 to 320 Ω

NG → See step   8 

OK: Go to next step 

1. Disconnect the connector from the air conditioning amplifier.
   Fig 4: Checking Harness And Connector (A/C Amplifier - A/C Lock Sensor)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.
   Fig 5: Measuring Resistance Of Compressor And Magnetic Clutch A/C Lock Sensor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Condition	Specified Condition
   D37-8 (LOCK) - B66-1 (SSR+)	Always	Below 1 Ω
   D37-13 (SG-2) - B66-2 (SSR-)	Always	Below 1 Ω
   D37-8 (LOCK) - Body ground	Always	10 kΩ or higher
   D37-13 (SG-2) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   7