Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)

Disconnect the R24 and L93 ECU connectors.
Measure the resistance according to the value(s) in the table below.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
R24-23 (MPX1) - L93-5 (S1)	Always	Below 1 Ω

Fig 1: Checking Harness And Connector (Communication Line)

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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (MAYDAY ECU - VEHICLE BATTERY AND BODY GROUND)

Disconnect the R24 ECU connector.

Fig 2: Identifying R24 ECU Connector

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Measure the voltage and resistance according to the value(s) in the table below

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
R24-1 (+B) - Body ground	Always	11 to 14 V

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
R24-12 (E) - Body ground	Always	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION