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.

INSPECT FUSE (RR MPX-B 1, RR-ACC)

Disconnect the RR MPX-B 1 and RR-ACC fuse from the luggage room junction block.

Measure the resistance of the fuses.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
RR MPX-B 1 fuse	Always	Below 1 Ω
RR-ACC fuse	Always	Below 1 Ω

NG: REPLACE FUSE

OK: Go to next step

CHECK HARNESS AND CONNECTOR (TUNER - BATTERY AND BODY GROUND)

Disconnect the R27 receiver connector.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
R27-7 (GND) - Body ground	Always	Below 1 Ω

Fig 1: Checking Harness And Connector (Tuner - Battery And Body Ground)

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Switch Condition	Specified Condition
R27-12 (+B) - Body ground	Always	11 to 14 V
R27-11 (ACC) - Body ground	Power switch ON (ACC)	11 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )