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, ...
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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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