REAR POWER SEAT CONTROL SYSTEM (w/ Memory) TERMINALS OF ECU
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POSITION CONTROL ECU ASSEMBLY
Text in Illustration *A for Rear Right Seat *B for Rear Left Seat
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for Rear Right Seat
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Disconnect the X8 and X9 position control ECU assembly (for rear right seat).
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Measure the voltage and resistance according to the value(s) in the table below.
Tech Tips
Measure the values on the wire harness side with the connector disconnected.
Terminal Connection Wiring Color Terminal Description Condition Specified Condition X8-4 (+B) - Body ground V - Body ground Battery power supply Always 11 to 14 V X9-3 (IG) - Body ground L - Body ground Ignition power supply (IG signal) Engine switch on (IG) → off 11 to 14 V → Below 1 V X8-8 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω X9-5 (RMSS) - X9-17 (SSWE) V - W-B SET switch signal input SET switch pressed and held Below 1 Ω X9-37 (RMS1) - X9-17 (SSWE) P - W-B M1 switch signal input M1 switch pressed and held Below 1 Ω X9-38 (RMS2) - X9-17 (SSWE) LG - W-B M2 switch signal input M2 switch pressed and held Below 1 Ω X9-14 (RTNS) - X9-17 (SSWE) W - W-B Return switch signal input Return switch pressed and held Below 1 Ω X9-15 (OTSU) - X9-17 (SSWE) G - W-B Ottoman switch (up) signal input Ottoman switch (up) pressed and held Below 1 Ω X9-16 (OTSD) - X9-17 (SSWE) W - W-B Ottoman switch (store) signal input Ottoman switch (store) pressed and held Below 1 Ω X9-12 (RCSU) - X9-17 (SSWE) SB - W-B Reclining switch (forward) signal input Reclining switch (forward) pressed and held Below 1 Ω X9-13 (RCSD) - X9-17 (SSWE) GR - W-B Reclining switch (backward) signal input Reclining switch (backward) pressed and held Below 1 Ω If the result is not as specified, there may be a malfunction in the wire harness.
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Reconnect the X8 and X9 position control ECU assembly (for rear right seat).
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Measure the voltage and resistance according to the value(s) in the table below.
Terminal Connection Wiring Color Terminal Description Condition Specified Condition X8-1 (OTOU) - X8-8 (GND) W - W-B Ottoman motor signal
(Up)
Ottoman switch off Below 1 V Ottoman switch on
(Up)
11 to 14 V X8-5 (OTOD) - X8-8 (GND) R - W-B Ottoman motor signal
(Store)
Ottoman switch off Below 1 V Ottoman switch on
(Store)
11 to 14 V X8-2 (RCLU) - X8-8 (GND) BR - W-B Reclining motor signal
(Forward)
Reclining switch off Below 1 V Reclining switch on
(Forward)
11 to 14 V X8-6 (RLCD) - X8-8 (GND) P - W-B Reclining motor signal
(Backward)
Reclining switch off Below 1 V Reclining switch on
(Backward)
11 to 14 V X9-24 (OSRV) - X9-30 (OSRG) G - W-B Ottoman position signal Ottoman switch on 4.8 V or more X9-25 (RSRV) - X9-36 (RSRG) LG - W-B Reclining position signal Reclining switch on 4.8 V or more If the result is not as specified, the position control ECU assembly (for rear right seat) may have a malfunction.
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for Rear Left Seat
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Disconnect the Y8 and Y9 position control ECU assembly (for rear left seat).
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Measure the voltage and resistance according to the value(s) in the table below.
Tech Tips
Measure the values on the wire harness side with the connector disconnected.
Terminal Connection Wiring Color Terminal Description Condition Specified Condition Y8-4 (+B) - Body ground V - Body ground Battery power supply Always 11 to 14 V Y9-3 (IG) - Body ground L - Body ground Ignition power supply (IG signal) Engine switch on (IG) → off 11 to 14 V → Below 1 V Y8-8 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω Y9-5 (RMSS) - Y9-17 (SSWE) V - W-B SET switch signal input SET switch pressed and held Below 1 Ω Y9-37 (RMS1) - Y9-17 (SSWE) P - W-B M1 switch signal input M1 switch pressed and held Below 1 Ω Y9-38 (RMS2) - Y9-17 (SSWE) LG - W-B M2 switch signal input M2 switch pressed and held Below 1 Ω Y9-14 (RTNS) - Y9-17 (SSWE) W - W-B Return switch signal input Return switch pressed and held Below 1 Ω Y9-15 (OTSU) - Y9-17 (SSWE) G - W-B Ottoman switch (up) signal input Ottoman switch (up) pressed and held Below 1 Ω Y9-16 (OTSD) - Y9-17 (SSWE) W - W-B Ottoman switch (store) signal input Ottoman switch (store) pressed and held Below 1 Ω Y9-12 (RCSU) - Y9-17 (SSWE) SB - W-B Reclining switch (forward) signal input Reclining switch (forward) pressed and held Below 1 Ω Y9-13 (RCSD) - Y9-17 (SSWE) GR - W-B Reclining switch (backward) signal input Reclining switch (backward) pressed and held Below 1 Ω If the result is not as specified, there may be a malfunction in the wire harness.
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Reconnect the Y8 and Y9 position control ECU assembly (for rear left seat).
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Measure the voltage and resistance according to the value(s) in the table below.
Terminal Connection Wiring Color Terminal Description Condition Specified Condition Y8-1 (OTOU) - Y8-8 (GND) W - W-B Ottoman motor signal
(Up)
Ottoman switch off Below 1 V Ottoman switch on
(Up)
11 to 14 V Y8-5 (OTOD) - Y8-8 (GND) R - W-B Ottoman motor signal
(Store)
Ottoman switch off Below 1 V Ottoman switch on
(Store)
11 to 14 V Y8-2 (RCLU) - Y8-8 (GND) BR - W-B Reclining motor signal
(Forward)
Reclining switch off Below 1 V Reclining switch on
(Forward)
11 to 14 V Y8-6 (RLCD) - Y8-8 (GND) P - W-B Reclining motor signal
(Backward)
Reclining switch off Below 1 V Reclining switch on
(Backward)
11 to 14 V Y9-24 (OSRV) - Y9-30 (OSRG) G - W-B Ottoman position signal Ottoman switch on 4.8 V or more Y9-25 (RSRV) - Y9-36 (RSRG) LG - W-B Reclining position signal Reclining switch on 4.8 V or more If the result is not as specified, the position control ECU assembly (for rear left seat) may have a malfunction.
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