Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VK16
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1451/51; Compressor Solenoid Circuit; 2016 - 2020 MY Sienna [12/2015 -        ]

DTC

B1451/51

Compressor Solenoid Circuit

DESCRIPTION

In this circuit, the compressor and magnetic clutch receives a refrigerant compression demand signal from the air conditioning amplifier.

Based on this signal, the compressor and magnetic clutch changes the amount of compressor output.

DTC Code

DTC Detection Condition

Trouble Area

B1451/51

Open or short in compressor and magnetic clutch solenoid circuit
  • Compressor and magnetic clutch (solenoid valve)
  • Harness or connector between air conditioning amplifier and compressor and magnetic clutch (solenoid valve)
  • Air conditioning amplifier

WIRING DIAGRAM

PROCEDURE

1.

INSPECT COMPRESSOR AND MAGNETIC CLUTCH (SOLENOID VALVE)

(a) Disconnect the compressor and magnetic clutch (solenoid valve) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B34-2 (SOL+) - B34-1 (SOL-)

20°C (68°F)

10 to 11 Ω

Text in Illustration

*a

Component without harness connected

(Compressor and magnetic clutch (Solenoid Valve))
NG

REPLACE COMPRESSOR AND MAGNETIC CLUTCH (SOLENOID VALVE)

OK

2.

CHECK HARNESS AND CONNECTOR (COMPRESSOR AND MAGNETIC CLUTCH (SOLENOID VALVE) - BODY GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B34-1 (SOL-) - Body ground

Always

Below 1 Ω

Text in Illustration

*a

Front view of wire harness connector

(to Compressor and magnetic clutch (Solenoid Valve))
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

CHECK HARNESS AND CONNECTOR (COMPRESSOR AND MAGNETIC CLUTCH (SOLENOID VALVE) - AIR CONDITIONING AMPLIFIER)

(a) Disconnect the air conditioning amplifier connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D75-2 (SOL+) - B34-2 (SOL+)

Always

Below 1 Ω

D75-2 (SOL+) - Body ground

Always

10 kΩ or higher

Result

Result

Proceed to

NG

A

OK (When troubleshooting according to Problem Symptoms Table)

B

OK (When troubleshooting according to the DTC)

C
A

REPAIR OR REPLACE HARNESS OR CONNECTOR
B

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

(See page 2016 MY Sienna [12/2015 - 08/2016]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: PROBLEM SYMPTOMS TABLE 2017 - 2020 MY Sienna [08/2016 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: PROBLEM SYMPTOMS TABLE )
C

REPLACE AIR CONDITIONING AMPLIFIER