Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Terminals Of Ecu
TERMINALS OF ECU
CHECK SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)
(a) Disconnect the U2 sliding roof ECU (sliding roof drive gear sub-assembly) connector.
(b) Measure the resistance and voltage according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connector disconnected.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| U2-1 (B) - U2-2 (E) | P - W-B | Battery power supply | Always | 11 to 14 V |
| U2-6 (IG) - U2-2 (E) | B - W-B | IG power supply | Engine switch off | Below 1 V |
| U2-6 (IG) - U2-2 (E) | B - W-B | IG power supply | Engine switch on (IG) | 11 to 14 V |
| U2-2 (E) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
If the result is not as specified, there may be a malfunction in the wire harness.
(c) Reconnect the U2 sliding roof ECU (sliding roof drive gear sub-assembly) connector.
(d) Measure the voltage according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| U2-10 (OPN) - U2-2 (E) | L - W-B | Sliding roof motor open | Engine switch on (IG), OPEN switch on | Below 1 V |
| U2-10 (OPN) - U2-2 (E) | L - W-B | Sliding roof motor open | Engine switch on (IG), OPEN switch off | 11 to 14 V |
| U2-9 (CLS) - U2-2 (E) | R - W-B | Sliding roof motor close | Engine switch on (IG), CLOSE switch on | Below 1 V |
| U2-9 (CLS) - U2-2 (E) | R - W-B | Sliding roof motor close | Engine switch on (IG), CLOSE switch off | 11 to 14 V |
| U2-5 (OPN) - U2-2 (E) | W - W-B | Sliding roof motor up | Engine switch on (IG), UP switch on | Below 1 V |
| U2-5 (OPN) - U2-2 (E) | W - W-B | Sliding roof motor up | Engine switch on (IG), UP switch off | 11 to 14 V |
| U2-9 (CLS) - U2-2 (E) | R - W-B | Sliding roof motor down | Engine switch on (IG), DOWN switch on | Below 1 V |
| U2-9 (CLS) - U2-2 (E) | R - W-B | Sliding roof motor down | Engine switch on (IG), DOWN switch off | 11 to 14 V |
If the result is not as specified, the sliding roof ECU (sliding roof drive gear sub-assembly) may be malfunctioning.
CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
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Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT:
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of ...
Diagnosis System
DIAGNOSIS SYSTEM DESCRIPTION (a) Sliding roof system data and Diagnostic Trouble Codes (DTCs) can be read through the vehicle Data Link Connector 3 (DLC3). When the system seems to be malfunctioning, ...
Other materials:
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Sfi System: VC Output Circuit
DESCRIPTION The ECM constantly generates a 5 V power source voltage from the battery voltage supplied to the +B, +B2 (BATT) terminals to operate the microprocessor. The ECM also provides this power to the sensors through the VC output circuit. When the VC circuit has a short circuit, the microproce ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Steering Gear: Reassembly
REASSEMBLY PROCEDURE 1. INSTALL NO. 2 STEERING RACK BOOT (a) Apply lithium soap base glycol grease to the inside of the small opening of a new No. 2 steering rack boot. Lithium Soap Base Glycol Grease (b) Install the No. 2 steering rack boot to the groove on the rack housing. NOTICE:
Be ...
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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