Toyota Sienna Service Manual: Compressor Lock Sensor Circuit
DTC B1422/22 Compressor Lock Sensor Circuit
SYSTEM DESCRIPTION
The ECM sends an engine speed signal to the A/C amplifier via CAN communication and BEAN communication.
The A/C amplifier reads the difference between compressor speed and engine
speed. When the
difference becomes too large, the A/C amplifier determines that the compressor
locks, and turns the
magnetic clutch off.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 CHECK CAN COMMUNICATION SYSTEM
(a) Use the intelligent tester to check if the CAN communication system is functioning normally.
Result 
2 CHECK MULTIPLEX COMMUNICATION SYSTEM
(a) Use the intelligent tester to check if the multiplex communication system (BEAN) is functioning normally.
Result 
3 INSPECT A/C AMPLIFIER
(a) Remove the A/C amplifier with the connectors still connected.
(b) Measure the waveform of the connector.
Standard 
Result 
4 INSPECT COMPRESSOR AND MAGNETIC CLUTCH (A/C LOCK SENSOR)
(a) Disconnect the connector from the A/C compressor.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance 
5 CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - A/C LOCK SENSOR)
(a) Disconnect the connector from the A/C amplifier.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance 
REPLACE A/C AMPLIFIER
Solar Sensor Circuit (Passenger Side)
DTC B1421/21 Solar Sensor Circuit (Passenger Side)
DESCRIPTION
The solar sensor, which is installed on the upper side of the instrument
panel, detects sunlight and
controls the air conditioni ...
Pressure Sensor Circuit
DTC B1423/23 Pressure Sensor Circuit
DESCRIPTION
This DTC is output when refrigerant pressure on the high pressure side is
extremely low (0.19 MPa (2.0
kgf/cm2, 28 psi) or less) or extremely high ...
Other materials:
Cup holders
Front
Press in and release the front cup
holder.
Console box type A
(if equipped)
Console box type B
(if equipped)
Pull the lid down.
Console box type C
(if equipped)
Second seat (if equipped)
Removing the second center seat.
Rear
...
Radio and Navigation Assembly Power Source Circuit
DESCRIPTION
This is the power source circuit to operate the radio and navigation
assembly.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT RADIO AND NAVIGATION ASSEMBLY
Disconnect the radio and navigation assembly connector
R15.
Measure the resistance according to the value ...
Definition of terms
Terms
Definitions
Monitor Description
Description of what ECM monitors and how to detect malfunctions
(monitoring purpose and details).
Related DTCs
A group of diagnostic trouble codes that are output by ECM based on
the same malfunction detection lo ...
