- Power switch on (IG), shift lever is P → other than P
- Power switch on (IG), stop light switch assembly on → off
- Power switch on (IG), parking brake switch assembly on → off
Lexus NX: Terminals Of Ecu
Lexus NX Service Manual / Vehicle Interior / Seat / Rear Power Seat Control System / Terminals Of Ecu
TERMINALS OF ECU
CHECK FOLD SEAT CONTROL ECU (REAR RIGHT SEAT)
(a) Disconnect the h3 and h4 fold seat control ECU (rear right 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 |
|---|---|---|---|---|
| h3-1 (ECUB) - Body ground | W - Body ground | Battery power source | Power switch off | 11 to 14 V |
| h3-3 (IG) - Body ground | B - Body ground | IG power source | Power switch on (IG) | 11 to 14 V |
| Power switch off | Below 1 V | |||
| h3-40 (IND2) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
| h4-1 (IND1) - Body ground | B - Body ground | Battery power source | Power switch off | 11 to 14 V |
| h4-2 (+B) - Body ground | W - Body ground | Battery power source | Power switch off | 11 to 14 V |
| h4-9 (GND2) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
| h4-10 (GND) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
(c) Reconnect the h3 and h4 fold seat control ECU (rear right seat) connectors.
(d) Measure the resistance and voltage according to the value(s) in the table below.
(e) Check for pulses according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| h3-7 (RCLR) - Body ground | SB - Body ground | Rear power seat switch signal (return, backward) | Rear power seat switch (rear right seat) off → on (return, backward) | 11 to 14 V → Below 1 V |
| h3-8 (SG1) - Body ground | G - Body ground | Ground | Always | Below 1 Ω |
| h3-10 (SFLD) - h3-8 (SG1) | P - G | Folding position sensor signal | Motor operating | Pulse generation |
| h3-11 (SV1) - h3-8 (SG1) | R - G | Folding position sensor power supply | Power switch off → on (IG) | Below 1 V → 5.5 to 8 V |
| h3-12 (RCLF) - Body ground | G - Body ground | Rear power seat switch (rear right seat) signal (fold, forward) | Rear power seat switch (rear right seat) off → on (fold, forward) | 11 to 14 V → Below 1 V |
| h3-13 (RTN2) - Body ground | LG - Body ground | No. 1 fold seat switch assembly (rear right seat) signal (return) | No. 1 fold seat switch assembly (rear right seat) off → on (return) | 11 to 14 V → Below 1 V |
| h3-14 (FLD2) - Body ground | V - Body ground | No. 1 fold seat switch assembly (rear right seat) signal (fold) | No. 1 fold seat switch assembly (rear right seat) off → on (fold) | 11 to 14 V → Below 1 V |
| h3-17 (P) - Body ground | GR - Body ground | Driving condition signal | | 11 to 14 V → Below 1 V |
| Power switch off | 11 to 14 V | |||
| h3-18 (R CL) - Body ground | P - Body ground | Rear door courtesy light switch assembly RH signal | Rear door RH opened → closed | 11 to 14 V → Below 1 V |
| h3-19 (BDCY) - Body ground | R - Body ground | Back door courtesy light switch assembly signal | Back door opened → closed | 11 to 14 V → Below 1 V |
| h3-25 (RTRN) - Body ground | B - Body ground | No. 2 fold seat switch assembly (rear right seat) signal (return) | No. 2 fold seat switch assembly (rear right seat) off → on (return) | 11 to 14 V → Below 1 V |
| h3-26 (FOLD) - Body ground | L - Body ground | No. 2 fold seat switch assembly (rear right seat) signal (fold) | No. 2 fold seat switch assembly (rear right seat) off → on (fold) | 11 to 14 V → Below 1 V |
| h4-3 (RCL+) - Body ground | P - Body ground | Reclining motor operation signal | Rear power seat switch (rear right seat) off → on (forward) | Below 1 V → 11 to 14 V |
| h4-4 (FLD+) - Body ground | L - Body ground | Fold motor operation signal | Rear power seat switch (rear right switch), No. 1 fold seat switch assembly (rear right switch) or No. 2 fold seat switch assembly (rear right switch) off → on (fold) | Below 1 V → 11 to 14 V |
| h4-7 (RCL-) - Body ground | LG - Body ground | Reclining motor operation signal | Rear power seat switch (rear right seat) off → on (backward) | Below 1 V → 11 to 14 V |
| h4-8 (FLD-) - Body ground | SB - Body ground | Return motor operation signal | Rear power seat switch (rear right switch), No. 1 fold seat switch assembly (rear right switch) or No. 2 fold seat switch assembly (rear right switch) off → on (return) | Below 1 V → 11 to 14 V |
CHECK FOLD SEAT CONTROL ECU (REAR LEFT SEAT)
(a) Disconnect the i3 and i4 fold seat control ECU (rear left 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 |
|---|---|---|---|---|
| i3-1 (ECUB) - Body ground | W - Body ground | Battery power source | Power switch off | 11 to 14 V |
| i3-3 (IG) - Body ground | B - Body ground | IG power source | Power switch on (IG) | 11 to 14 V |
| Power switch off | Below 1 V | |||
| i3-40 (IND2) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
| i4-1 (IND1) - Body ground | B - Body ground | Battery power source | Power switch off | 11 to 14 V |
| i4-2 (+B) - Body ground | W - Body ground | Battery power source | Power switch off | 11 to 14 V |
| i4-9 (GND2) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
| i4-10 (GND) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
(c) Reconnect the i3 and i4 fold seat control ECU (rear left seat) connectors.
(d) Measure the resistance and voltage according to the value(s) in the table below.
(e) Check for pulses according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| i3-7 (RCLR) - Body ground | SB - Body ground | Rear power seat switch signal (return, backward) | Rear power seat switch (rear left seat) off → on (return, backward) | 11 to 14 V → Below 1 V |
| i3-8 (SG1) - Body ground | G - Body ground | Ground | Always | Below 1 Ω |
| i3-10 (SFLD) - i3-8 (SG1) | P - G | Folding position sensor signal | Motor operating | Pulse generation |
| i3-11 (SV1) - i3-8 (SG1) | R - G | Folding position sensor power supply | Power switch off → on (IG) | Below 1 V → 5.5 to 8 V |
| i3-12 (RCLF) - Body ground | G - Body ground | Rear power seat switch (rear left seat) signal (fold, forward) | Rear power seat switch (rear left seat) off → on (fold, forward) | 11 to 14 V → Below 1 V |
| i3-13 (RTN2) - Body ground | LG - Body ground | No. 1 fold seat switch assembly (rear left seat) signal (return) | No. 1 fold seat switch assembly (rear left seat) off → on (return) | 11 to 14 V → Below 1 V |
| i3-14 (FLD2) - Body ground | V - Body ground | No. 1 fold seat switch assembly (rear left seat) signal (fold) | No. 1 fold seat switch assembly (rear left seat) off → on (fold) | 11 to 14 V → Below 1 V |
| i3-17 (P) - Body ground | GR - Body ground | Driving condition signal |
| 11 to 14 V → Below 1 V |
| Power switch off | 11 to 14 V | |||
| i3-18 (R CL) - Body ground | P - Body ground | Rear door courtesy light switch assembly LH signal | Rear door LH opened → closed | 11 to 14 V → Below 1 V |
| i3-19 (BDCY) - Body ground | R - Body ground | Back door courtesy light switch assembly signal | Back door opened → closed | 11 to 14 V → Below 1 V |
| i3-25 (RTRN) - Body ground | B - Body ground | No. 2 fold seat switch assembly (rear left seat) signal (return) | No. 2 fold seat switch assembly (rear left seat) off → on (return) | 11 to 14 V → Below 1 V |
| i3-26 (FOLD) - Body ground | L - Body ground | No. 2 fold seat switch assembly (rear left seat) signal (fold) | No. 2 fold seat switch assembly (rear left seat) off → on (fold) | 11 to 14 V → Below 1 V |
| i4-3 (RCL+) - Body ground | P - Body ground | Reclining motor operation signal | Rear power seat switch (rear left seat) off → on (forward) | Below 1 V → 11 to 14 V |
| i4-4 (FLD+) - Body ground | L - Body ground | Fold motor operation signal | Rear power seat switch (rear left switch), No. 1 fold seat switch assembly (rear left switch) or No. 2 fold seat switch assembly (rear left switch) off → on (fold) | Below 1 V → 11 to 14 V |
| i4-7 (RCL-) - Body ground | LG - Body ground | Reclining motor operation signal | Rear power seat switch (rear left seat) off → on (backward) | Below 1 V → 11 to 14 V |
| i4-8 (FLD-) - Body ground | SB - Body ground | Return motor operation signal | Rear power seat switch (rear left switch), No. 1 fold seat switch assembly (rear left switch) or No. 2 fold seat switch assembly (rear left switch) off → on (return) | Below 1 V → 11 to 14 V |
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