Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Inspection

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Power Source & Network / Power Distribution / Integration Relay / Inspection

INSPECTION

PROCEDURE

1. INSPECT SEMICONDUCTOR POWER INTEGRATION ECU

(a) IG2 RELAY:

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B-1 - 1F-4

Battery voltage not applied between terminals 1E-1 and 1D-14

10 kΩ or higher

B-1 - 1G-3

B-1 - 1G-4

B-1 - 1F-4

Battery positive (+) → 1E-1

Battery negative (-) → 1D-14

Below 1 Ω

B-1 - 1G-3

B-1 - 1G-4

If the result is not as specified, replace the semiconductor power integration ECU.

*a

Component without harness connected

(Semiconductor Power Integration ECU)

(b) EFI-MAIN RELAY:

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B-1 - 1G-1

Battery voltage not applied between terminals 1G-6 and 1D-14

10 kΩ or higher

B-1 - 1G-2

B-1 - 1G-7

B-1 - 1G-8

1F-2 - 1G-1

B-1 - 1G-1

Battery positive (+) → 1G-6

Battery negative (-) → 1D-14

Below 1 Ω

B-1 - 1G-2

B-1 - 1G-7

B-1 - 1G-8

1F-2 - 1G-1

If the result is not as specified, replace the semiconductor power integration ECU.

*a

Component without harness connected

(Semiconductor Power Integration ECU)

(c) A/F RELAY:

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B-1 - 1F-1

Battery voltage not applied between terminals 1G-1 and 1D-14

10 kΩ or higher

B-1 - 1F-1

Battery positive (+) → 1G-1

Battery negative (-) → 1D-14

Below 1 Ω

If the result is not as specified, replace the semiconductor power integration ECU.

*a

Component without harness connected

(Semiconductor Power Integration ECU)

(d) H-LP RH-LO RELAY:

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B-1 - 1E-2

Battery voltage not applied between terminals B-1 and 1D-8

10 kΩ or higher

*a

Component without harness connected

(Semiconductor Power Integration ECU)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

1E-2 - Battery negative (-)

Battery positive (+) → B-1

Battery negative (-) → 1D-8

11 to 14 V

If the result is not as specified, replace the semiconductor power integration ECU.

(e) H-LP LH-LO RELAY:

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B-1 - 1E-3

Battery voltage not applied between terminals B-1 and 1D-8

10 kΩ or higher

*a

Component without harness connected

(Semiconductor Power Integration ECU)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

1E-3 - Battery negative (-)

Battery positive (+) → B-1

Battery negative (-) → 1D-8

11 to 14 V

If the result is not as specified, replace the semiconductor power integration ECU.

(f) Semiconductor power integration ECU ground:

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1D-14 - 1G-5

Always

Below 1 Ω

If the result is not as specified, replace the semiconductor power integration ECU.

*a

Component without harness connected

(Semiconductor Power Integration ECU)
    Removal
    REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed and installed, or replaced during int ...

    Installation
    INSTALLATION PROCEDURE 1. INSTALL SEMICONDUCTOR POWER INTEGRATION ECU (a) Connect the 5 connectors. (b) Engage the 2 claws to install the semiconductor power integration ECU as shown in the illustrati ...

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