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Home >> Lexus >> 2006 >> RX 400h AWD V6-3.3L (3MZ-FE) Hybrid >> Repair and Diagnosis >> Hybrid Drive Systems >> Power Control System >> System Main Relay, Hybrid Drive >> Testing and Inspection
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System Main Relay, Hybrid Drive: Testing and Inspection

INSPECTION

1. SMR1 AND SYSTEM MAIN RESISTOR




a. Measure the resistance between the 3 (CON1) and 4 (GND) terminals of the connector for the relay drive of the HV relay assembly.

Standard resistance: 70 to 165 Ohms (at -30 degrees C (-22 degrees F) to 80 degrees C (176 degrees F))

b. Increase battery voltage between the 3 (CON1) and 4 (GND) terminals of the connector for the relay drive of the HV relay assembly, and measure the resistance between the terminal of the HV battery side positive connector and the w/ convertor inverter assembly side positive terminal of the HV relay assembly.

HINT: The standard resistance indicates the resistance of the system main resistor.

Standard resistance: 28.5 to 31.5 Ohms

2. SMR2




a. Measure the resistance between the 1 (CON2) and 4 (GND) terminals of the connector for the relay drive of the HV relay assembly.

Standard resistance: 20 to 60 Ohms (at -35 degrees C (-31 degrees F) to 80 degrees C (176 degrees F))

b. Increase battery voltage between the 1 (CON2) and 4 (GND) terminals of the connector for the relay drive of the HV relay assembly, and measure the resistance between the terminal of the HV battery side positive connector and the w/ converter inverter assembly side positive terminal of the HV relay assembly.

Standard resistance: Below 1 Ohms

3. SMR3




a. Measure the resistance between the 2 (CON3) and 4 (GND) terminals of the connector for the relay drive of the HV relay assembly.

Standard resistance: 20 to 60 Ohms (at -35 degrees C (-31 degrees F) to 80 degrees C (176 degrees F))

b. Increase battery voltage between the 2 (CON3) and 4 (GND) terminals of the connector for the relay drive of the HV relay assembly, and measure the resistance between the terminal of the HV battery side negative connector and the w/ converter inverter assembly side negative terminal of the HV relay assembly.

Standard resistance: Below 1 Ohms
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