Lexus NX: Terminals Of Ecu
TERMINALS OF ECU
CHECK FRONT POWER SEAT SWITCH LH
(a) Disconnect the g11 and g12 front power seat switch LH connectors.
(b) Measure the voltage and resistance according to the value(s) in the table below.
| Tester Connection | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| g11-2 (GND) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
| g11-7 (+B) - Body ground | W - Body ground | Battery power supply | Power switch off | 11 to 14 V |
| g12-12 (SYSB) - Body ground | P - Body ground | System power source | Power switch off | 11 to 14 V |
| g12-3 (IG) - Body ground | P - Body ground | IG power supply | Power switch on (IG) | 11 to 14 V |
| Power switch off | Below 1 V | |||
| g12-10 (DBCL) - Body ground | GR - Body ground | Driver seat belt buckle switch signal | Driver seat belt fastened | Below 1 Ω |
| Driver seat belt unfastened | 10 kΩ or higher |
(c) Reconnect the g11 and g12 front power seat switch LH connectors.
(d) Measure the voltage and resistance according to the value(s) in the table below.
| Tester Connection | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| g11-6 (+B2) - Body ground | SB - Body ground | Lumbar support adjuster power source | Power switch off | 11 to 14 V |
| g11-1 (GND2) - Body ground | W-B - Body ground | Lumbar support adjuster ground | Always | Below 1 Ω |
| g11-3 (SLD+) - Body ground | L - Body ground | Slide motor signal (forward) | Slide switch off | Below 1 V |
| Slide switch on (Forward) | 11 to 14 V | |||
| g11-4 (SLD-) - Body ground | GR - Body ground | Slide motor signal (rearward) | Slide switch off | Below 1 V |
| Slide switch on (Rearward) | 11 to 14 V | |||
| g11-5 (FRV-) - Body ground | R - Body ground | Front vertical motor signal (downward) | Front vertical switch off | Below 1 V |
| Front vertical switch on (Downward) | 11 to 14 V | |||
| g11-8 (FRV+) - Body ground | B - Body ground | Front vertical motor signal (upward) | Front vertical switch off | Below 1 V |
| Front vertical switch on (Upward) | 11 to 14 V | |||
| g11-9 (RCL+) - Body ground | P - Body ground | Reclining motor signal (forward) | Reclining switch off | Below 1 V |
| Reclining switch on (Forward) | 11 to 14 V | |||
| g11-11 (RCL-) - Body ground | LG - Body ground | Reclining motor signal (rearward) | Reclining switch off | Below 1 V |
| Reclining switch on (Rearward) | 11 to 14 V | |||
| g11-10 (LFT+) - Body ground | V - Body ground | Rear lifter motor signal (upward) | Rear lifter switch off | Below 1 V |
| Rear lifter switch on (Upward) | 11 to 14 V | |||
| g11-12 (LFT-) - Body ground | G - Body ground | Rear lifter motor signal (downward) | Rear lifter switch off | Below 1 V |
| Rear lifter switch on (Downward) | 11 to 14 V | |||
| g12-1 (SGND) - Body ground | BR - Body ground | Position sensor ground | Always | Below 1 Ω |
| g12-5 (SSRS) - g12-1 (SGND) | G- BR | Slide position signal | Slide function operating | 4.8 to 5.1 V |
CHECK OUTER MIRROR CONTROL ECU ASSEMBLY (for Driver Side)
(a) Disconnect the M5 outer mirror control ECU assembly (for Driver Side) connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
| Tester Connection | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| M5-5 (SIG) - Body ground | GR - Body ground | IG power supply | Power switch on (IG) | 11 to 14 V |
| Power switch off | Below 1 V | |||
| M5-6 (CPUB) - Body ground | GR - Body ground | Battery power supply | Power switch off | 11 to 14 V |
| M5-7 (GND) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
| M5-14 (BDR) - Body ground | Y - Body ground | Battery power supply | Power switch off | 11 to 14 V |
(c) Reconnect the M5 outer mirror control ECU assembly (for Driver Side) connector.
(d) Measure the voltage according to the value(s) in the table below.
| Tester Connection | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| M5-1 (MM) - M5-7 (GND) | L - W-B | SET switch signal for seat memory switch | SET switch on | Below 1 V |
| SET switch off | 11 to 14 V | |||
| M5-2 (M1) - M5-7 (GND) | G - W-B | M1 switch signal for seat memory switch | M1 switch on | Below 1 V |
| M1 switch off | 11 to 14 V | |||
| M5-3 (M2) - M5-7 (GND) | P - W-B | M2 switch signal for seat memory switch | M2 switch on | Below 1 V |
| M2 switch off | 11 to 14 V | |||
| M5-4 (M3) - M5-7 (GND) | B - W-B | M3 switch signal for seat memory switch | M3 switch on | Below 1 V |
| M3 switch off | 11 to 14 V |
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Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
A bolt without a torque specification is shown in the standard bolt chart.
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