TERMINALS OF ECU
CHECK FOLD SEAT CONTROL ECU (RH SEAT)
(a) Disconnect the x15 and x16 fold seat control ECU (RH seat) connectors.
(b) Measure the resistance and voltage according to the value(s) in the table below.
Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
---|---|---|---|---|
x16-2 (+B) - Body ground | W - Body ground | Battery power supply | Always | 11 to 14 V |
x16-1 (IND1) - Body ground | B - Body ground | Battery power supply | Always | 11 to 14 V |
x15-1 (ECUB) - Body ground | W - Body ground | System power source | Always | 11 to 14 V |
x15-3 (IG) - Body ground | B - Body ground | IG switch signal | Engine switch off | Below 1 V |
IG switch signal | Engine switch on (IG) | 11 to 14 V | ||
x16-10 (GND) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
x16-9 (GND2) - Body ground | W-B - Body ground | IG switch signal | Always | Below 1 Ω |
x15-40 (IND2) - Body ground | W-B - Body ground | System ground | Always | Below 1 Ω |
(c) Reconnect the x15 and x16 fold seat control ECU (RH seat) connectors.
(d) Measure the resistance and voltage according to the value(s) in the table below.
(e) Using an oscilloscope, check the waveform.
Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
---|---|---|---|---|
x16-4 (FLD+) - Body ground | L - Body ground | Lifter motor operation signal (Fold) | Fold switch (RH) of fold seat switch assembly or No. 1 fold seat switch assembly released → pushed (Fold operation) | Below 1 V → 11 to 14 V |
x16-8 (FLD-) - Body ground | SB - Body ground | Lifter motor operation signal (Return) | Return switch (RH) of fold seat switch assembly or No. 1 fold seat switch assembly released → pushed (Return operation) | Below 1 V → 11 to 14 V |
x15-11 (SV1) - x15-8 (SG1) | R - G | Lifter motor position sensor power source | Engine switch off → Engine switch on (IG) | Below 1 V → 5.5 to 10 V |
x15-10 (SFLD) - x15-8 (SG1) | P - G | Lifter motor position sensor signal | Lifter motor (RH) operating (Fold/return operation) | Pulse generation (Hi: 5.5 to 10 V, Lo: Below 1 V) |
x15-8(SG1) - Body ground | G - Body ground | Lifter motor position sensor ground | Always | Below 1 Ω |
x16-3 (RCL+) - Body ground | L - Body ground | Reclining motor operation signal (Fold) | Fold switch (RH) of fold seat switch assembly or No. 1 fold seat switch assembly released → pushed (Fold operation) | Below 1 V → 11 to 14 V |
x16-7 (RCL-) - Body ground | SB - Body ground | Reclining motor operation signal (Fold) | Return switch (RH) of fold seat switch assembly or No. 1 fold seat switch assembly released → pushed (Return operation) | Below 1 V → 11 to 14 V |
x15-31 (SV2) - x15-28 (SG2) | R - G | Reclining motor position sensor power source | Engine switch off → Engine switch on (IG) | Below 1 V → 5.5 to 10 V |
x15-9 (SRCL) - x15-28 (SG2) | P - G | Reclining motor position sensor signal | Reclining motor (RH) operating (Fold/return operation) | Pulse generation (Hi: 5.5 to 10 V, Lo: Below 1 V) |
x15-28 (SG2) - Body ground | G - Body ground | Reclining motor position sensor ground | Always | Below 1 Ω |
x15-25 (RCLR) - Body ground | B - Body ground | Fold seat switch assembly (return switch (RH)) operation signal | Return switch (RH) of fold seat switch assembly released → pushed | 11 to 14 V → Below 1 V |
x15-26 (RCLF) - Body ground | L - Body ground | Fold seat switch assembly (fold switch (RH)) operation signal | Fold switch (RH) of fold seat switch assembly released → pushed | 11 to 14 V → Below 1 V |
x15-7 (RTRN) - Body ground | B - Body ground | Fold seat switch assembly (return switch (RH)) operation signal | Return switch (RH) of No. 1 fold seat switch assembly released → pushed | 11 to 14 V → Below 1 V |
x15-12 (FOLD) - Body ground | L - Body ground | Fold seat switch assembly (fold switch (RH)) operation signal | Fold switch (RH) of No. 1 fold seat switch assembly released → pushed | 11 to 14 V → Below 1 V |
x15-17 (P) - Body ground | GR - Body ground | Driving condition signal | Any of the following conditions are met:
| 11 to 14 V |
Engine switch is on (IG) and any of the following conditions are met:
| Below 1 V | |||
x15-18 (R CL) - Body ground | P - Body ground | Rear door courtesy light switch assembly (RH) input signal | Rear door RH open → closed | Below 1 V → 11 to 14 V |
x15-19 (BDCY) - Body ground | R - Body ground | Back door courtesy light switch assembly input signal | Back door open → closed | Below 1 V → 11 to 14 V |
CHECK FOLD SEAT CONTROL ECU (LH SEAT)
(a) Disconnect the y15 and y16 fold seat control ECU (LH seat) connectors.
(b) Measure the resistance and voltage according to the value(s) in the table below.
Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
---|---|---|---|---|
y16-2 (+B) - Body ground | W - Body ground | Battery power supply | Always | 11 to 14 V |
y16-1 (IND1) - Body ground | B - Body ground | Battery power supply | Always | 11 to 14 V |
y15-1 (ECUB) - Body ground | W - Body ground | System power source | Always | 11 to 14 V |
y15-3 (IG) - Body ground | B - Body ground | IG switch signal | Engine switch off | Below 1 V |
Engine switch on (IG) | 11 to 14 V | |||
y16-10 (GND) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
y16-9 (GND2) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
y15-40 (IND2) - Body ground | W-B - Body ground | System ground | Always | Below 1 Ω |
(c) Reconnect the y15 and y16 fold seat control ECU (LH seat) connectors.
(d) Measure the resistance and voltage according to the value(s) in the table below.
(e) Using an oscilloscope, check the waveform.
Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
---|---|---|---|---|
y16-4 (FLD+) - Body ground | L - Body ground | Lifter motor operation signal (Fold) | Fold switch (LH) of fold seat switch assembly or No. 1 fold seat switch assembly released → pushed (Fold operation) | Below 1 V → 11 to 14 V |
y16-8 (FLD-) - Body ground | SB - Body ground | Lifter motor operation signal (Return) | Return switch (LH) of fold seat switch assembly or No. 1 fold seat switch assembly released → pushed (Return operation) | Below 1 V → 11 to 14 V |
y15-11 (SV1) - y15-8 (SG1) | R - G | Lifter motor position sensor power source | Engine switch off → Engine switch on (IG) | Below 1 V → 5.5 to 10 V |
y15-10 (SFLD) - y15-8 (SG1) | P - G | Lifter motor position sensor signal | Lifter motor (LH) operating (Fold/return operation) | Pulse generation (Hi: 5.5 to 10 V, Lo: Below 1 V) |
y15-8(SG1) - Body ground | G - Body ground | Lifter motor position sensor ground | Always | Below 1 Ω |
y16-3 (RCL+) - Body ground | L - Body ground | Reclining motor operation signal (Fold) | Fold switch (LH) of fold seat switch assembly or No. 1 fold seat switch assembly released → pushed (Fold operation) | Below 1 V → 11 to 14 V |
y16-7 (RCL-) - Body ground | SB - Body ground | Reclining motor operation signal (Fold) | Return switch (LH) of fold seat switch assembly or No. 1 fold seat switch assembly released → pushed (Return operation) | Below 1 V → 11 to 14 V |
y15-31 (SV2) - y15-28 (SG2) | R - B | Reclining motor position sensor power source | Engine switch off → Engine switch on (IG) | Below 1 V → 5.5 to 10 V |
y15-9 (SRCL) - y15-28 (SG2) | P - B | Reclining motor position sensor signal | Reclining motor (LH) operating (Fold/return operation) | Pulse generation (Hi: 5.5 to 10 V, Lo: Below 1 V) |
y15-28 (SG2) - Body ground | B - Body ground | Reclining motor position sensor ground | Always | Below 1 Ω |
y15-25 (RCLR) - Body ground | B - Body ground | Fold seat switch assembly (return switch (LH)) operation signal | Return switch (LH) of fold seat switch assembly released → pushed | 11 to 14 V → Below 1 V |
y15-26 (RCLF) - Body ground | L - Body ground | Fold seat switch assembly (fold switch (LH)) operation signal | Fold switch (LH) of fold seat switch assembly released → pushed | 11 to 14 V → Below 1 V |
y15-7 (RTRN) - Body ground | B - Body ground | Fold seat switch assembly (return switch (LH)) operation signal | Return switch (LH) of No. 1 fold seat switch assembly released → pushed | 11 to 14 V → Below 1 V |
y15-12 (FOLD) - Body ground | L - Body ground | Fold seat switch assembly (fold switch (LH)) operation signal | Fold switch (LH) of No. 1 fold seat switch assembly released → pushed | 11 to 14 V → Below 1 V |
y15-17 (P) - Body ground | GR - Body ground | Driving condition signal | Any of the following conditions are met:
| 11 to 14 V |
Engine switch is on (IG) and any of the following conditions are met:
| Below 1 V | |||
y15-18 (R CL) - Body ground | P - Body ground | Rear door courtesy light switch assembly (RH) input signal | Rear door RH open → closed | Below 1 V → 11 to 14 V |
y15-19 (BDCY) - Body ground | R - Body ground | Back door courtesy light switch assembly input signal | Back door open → closed | Below 1 V → 11 to 14 V |
CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
(a) Disconnect the MB main body ECU (multiplex network body ECU) connector.
Click here
(b) Measure the voltage and resistance according to the value(s) in the table below.
Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
---|---|---|---|---|
MB-31 (BECU) - Body ground | - | Battery power supply | Always | 11 to 14 V |
MB-32 (IG) - Body ground | - | IG power supply | Engine switch off | Below 1 V |
Engine switch on (IG) | 11 to 14 V | |||
MB-11 (GND1) - Body ground | - | Ground | Always | Below 1 Ω |
(c) Reconnect the MB main body ECU (multiplex network body ECU) connector.
Click here
(d) Check for pulses according to the value(s) in the table below.
Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
---|---|---|---|---|
J9-16 (SFTP) - Body ground | - | Driving condition signal | Any of the following conditions are met:
| 11 to 14 V |
Engine switch is on (IG) and any of the following conditions are met:
| Below 1 V |
Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Lighting System: How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use the following procedure to troubleshoot the lighting system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. CUSTOMER PROBLEM ANALYSIS AND SYMPTOM CHECK
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Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Differential Case: Reassembly
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