Lexus IS250 IS220d GSE20 ALE20 - SEAT
FRONT POWER SEAT CONTROL SYSTEM (w/ Seat Position Memory System) - TERMINALS OF ECU
| INSPECT FRONT POWER SEAT SWITCH LH (POSITION CONTROL ECU) |
Disconnect the U7 and U6 ECU connectors.
Measure the voltage and resistance according to the value(s) in the table below.
| Symbols (Terminal No.) | Wiring Color | Terminal Description | Condition | Specified Condition |
| IG (U7-4) - GND (U6-1) | Y - W-B | Engine switch signal | Engine switch off | Below 1 V |
| IG (U7-4) - GND (U6-1) | Y - W-B | Engine switch signal | Engine switch on (IG) | 10 to 14 V |
| +B (U6-5) - GND (U6-1) | L - W-B | Power source | Always | 10 to 14 V |
| SYSB (U7-8) - GND (U6-1) | LG - W-B | System power source | Always | 10 to 14 V |
| GND (U6-1) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
If the result is not as specified, there may be a malfunction on the wire harness side.
Reconnect the U7 and U6 ECU connectors.
Measure the voltage according to the value(s) in the table below.
| Symbols (Terminal No.) | Wiring Color | Terminal Description | Condition | Specified Condition |
| SLD+ (U6-2) - GND (U6-1) | B - W-B | Sliding motor signal (forward) | Slide switch OFF | Below 1 V |
| SLD+ (U6-2) - GND (U6-1) | B - W-B | Sliding motor signal (forward) | Slide switch FRONT ON | 10 to 14 V |
| SLD- (U6-3) - GND (U6-1) | G - W-B | Sliding motor signal (rearward) | Slide switch OFF | Below 1 V |
| SLD- (U6-3) - GND (U6-1) | G - W-B | Sliding motor signal (rearward) | Slide switch REAR ON | 10 to 14 V |
| FRV+ (U6-6) - GND (U6-1) | W - W-B | Front vertical motor signal (upward) | Front vertical switch OFF | Below 1 V |
| FRV+ (U6-6) - GND (U6-1) | W - W-B | Front vertical motor signal (upward) | Front vertical switch UP ON | 10 to 14 V |
| FRV- (U6-4) - GND (U6-1) | R - W-B | Front vertical motor signal (downward) | Front vertical switch OFF | Below 1 V |
| FRV- (U6-4) - GND (U6-1) | R - W-B | Front vertical motor signal (downward) | Front vertical switch DOWN ON | 10 to 14 V |
| LFT+ (U6-7) - GND (U6-1) | Y - W-B | Lifter motor signal (upward) | Lifter switch OFF | Below 1 V |
| LFT+ (U6-7) - GND (U6-1) | Y - W-B | Lifter motor signal (upward) | Lifter switch UP ON | 10 to 14 V |
| LFT- (U6-9) - GND (U6-1) | LG - W-B | Lifter motor signal (downward) | Lifter switch OFF | Below 1 V |
| LFT- (U6-9) - GND (U6-1) | LG - W-B | Lifter motor signal (downward) | Lifter switch DOWN ON | 10 to 14 V |
| RCL+ (U6-8) - GND (U6-1) | BR - W-B | Reclining motor signal (forward) | Reclining switch OFF | Below 1 V |
| RCL+ (U6-8) - GND (U6-1) | BR - W-B | Reclining motor signal (forward) | Reclining switch FRONT ON | 10 to 14 V |
| RCL- (U6-10) - GND (U6-1) | GR - W-B | Reclining motor signal (rearward) | Reclining switch OFF | Below 1 V |
| RCL- (U6-10) - GND (U6-1) | GR - W-B | Reclining motor signal (rearward) | Reclining switch REAR ON | 10 to 14 V |
If the result is not as specified, the front power seat switch LH (position control ECU) may have a malfunction.
| INSPECT FRONT POWER SEAT SWITCH RH (POSITION CONTROL ECU) |
Disconnect the T6 and T7 ECU connectors.
Measure the voltage and resistance according to the value(s) in the table below.
| Symbols (Terminal No.) | Wiring Color | Terminal Description | Condition | Specified Condition |
| IG (T7-4) - GND (T6-1) | B - W-B | Engine switch signal | Engine switch off | Below 1 V |
| IG (T7-4) - GND (T6-1) | B - W-B | Engine switch signal | Engine switch on (IG) | 10 to 14 V |
| +B (T6-5) - GND (T6-1) | L - W-B | Power source | Always | 10 to 14 V |
| SYSB (T7-8) - GND (T6-1) | P - W-B | System power source | Always | 10 to 14 V |
| GND (T6-1) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
If the result is not as specified, there may be a malfunction on the wire harness side.
Reconnect the T6 and T7 ECU connectors.
Measure the voltage according to the value(s) in the table below.
| Symbols (Terminal No.) | Wiring Color | Terminal Description | Condition | Specified Condition |
| SLD+ (T6-2) - GND (T6-1) | B - W-B | Sliding motor signal (forward) | Slide switch OFF | Below 1 V |
| SLD+ (T6-2) - GND (T6-1) | B - W-B | Sliding motor signal (forward) | Slide switch FRONT ON | 10 to 14 V |
| SLD- (T6-3) - GND (T6-1) | G - W-B | Sliding motor signal (rearward) | Slide switch OFF | Below 1 V |
| SLD- (T6-3) - GND (T6-1) | G - W-B | Sliding motor signal (rearward) | Slide switch REAR ON | 10 to 14 V |
| FRV+ (T6-6) - GND (T6-1) | W - W-B | Front vertical motor signal (upward) | Front vertical switch OFF | Below 1 V |
| FRV+ (T6-6) - GND (T6-1) | W - W-B | Front vertical motor signal (upward) | Front vertical switch UP ON | 10 to 14 V |
| FRV- (T6-4) - GND (T6-1) | R - W-B | Front vertical motor signal (downward) | Front vertical switch OFF | Below 1 V |
| FRV- (T6-4) - GND (T6-1) | R - W-B | Front vertical motor signal (downward) | Front vertical switch DOWN ON | 10 to 14 V |
| LFT+ (T6-7) - GND (T6-1) | Y - W-B | Lifter motor signal (upward) | Lifter switch OFF | Below 1 V |
| LFT+ (T6-7) - GND (T6-1) | Y - W-B | Lifter motor signal (upward) | Lifter switch UP ON | 10 to 14 V |
| LFT- (T6-9) - GND (T6-1) | LG - W-B | Lifter motor signal (downward) | Lifter switch OFF | Below 1 V |
| LFT- (T6-9) - GND (T6-1) | LG - W-B | Lifter motor signal (downward) | Lifter switch DOWN ON | 10 to 14 V |
| RCL+ (T6-8) - GND (T6-1) | BR - W-B | Reclining motor signal (forward) | Reclining switch OFF | Below 1 V |
| RCL+ (T6-8) - GND (T6-1) | BR - W-B | Reclining motor signal (forward) | Reclining switch FRONT ON | 10 to 14 V |
| RCL- (T6-10) - GND (T6-1) | GR - W-B | Reclining motor signal (rearward) | Reclining switch OFF | Below 1 V |
| RCL- (T6-10) - GND (T6-1) | GR - W-B | Reclining motor signal (rearward) | Reclining switch REAR ON | 10 to 14 V |
If the result is not as specified, the front power seat switch RH (position control ECU) may have a malfunction.
| CHECK OUTER MIRROR CONTROL ECU LH |
Disconnect the M10 ECU connector.
Measure the voltage and resistance according to the value(s) in the table below.
| Symbols (Terminal No.) | Wiring Color | Terminal Description | Condition | Specified Condition |
| GND (M10-1) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
| CPUB (M10-4) - GND (M10-1) | G - W-B | Battery (ECU power source) | Always | 10 to 14 V |
| SIG (M10-3) - GND (M10-1) | B - W-B | Engine switch (IG) power supply | Engine switch off | Below 1 V |
| SIG (M10-3) - GND (M10-1) | B - W-B | Engine switch (IG) power supply | Engine switch on (IG) | 10 to 14 V |
| BDR (M10-6) - GND (M10-1) | L - W-B | Battery (ECU power source) | Always | 10 to 14 V |
If the result is not as specified, there may be a malfunction on the wire harness side.
Reconnect the M10 ECU connector.
Measure the resistance according to the value(s) in the table below.
| Symbols (Terminal No.) | Wiring Color | Terminal Description | Condition | Specified Condition |
| MSWE (M10-26) - GND (M10-1) | O - W-B | Ground for seat memory switch | Always | Below 1 Ω |
| MM (M10-25) - MSWE (M10-26) | W - O | SET switch signal | SET switch OFF | 10 to 14 V |
| MM (M10-25) - MSWE (M10-26) | W - O | SET switch signal | SET switch ON | Below 1 V |
| M1 (M10-22) - MSWE (M10-26) | LG - O | M1 switch signal | M1 switch OFF | 10 to 14 V |
| M1 (M10-22) - MSWE (M10-26) | LG - O | M1 switch signal | M1 switch ON | Below 1 V |
| M2 (M10-23) - MSWE (M10-26) | R - O | M2 switch signal | M2 switch OFF | 10 to 14 V |
| M2 (M10-23) - MSWE (M10-26) | R - O | M2 switch signal | M2 switch ON | Below 1 V |
| M3 (M10-24) - MSWE (M10-26) | Y - O | M3 switch signal | M3 switch OFF | 10 to 14 V |
| M3 (M10-24) - MSWE (M10-26) | Y - O | M3 switch signal | M3 switch ON | Below 1 V |
If the result is not as specified, the outer mirror control ECU LH may have a malfunction.
| CHECK OUTER MIRROR CONTROL ECU RH |
Disconnect the L10 ECU connector.
Measure the voltage and resistance according to the value(s) in the table below.
| Symbols (Terminal No.) | Wiring Color | Terminal Description | Condition | Specified Condition |
| GND (L10-1) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
| CPUB (L10-4) - GND (L10-1) | G - W-B | Battery (ECU power source) | Always | 10 to 14 V |
| SIG (L10-3) - GND (L10-1) | B - W-B | Engine switch (IG) power supply | Engine switch off | Below 1 V |
| SIG (L10-3) - GND (L10-1) | B - W-B | Engine switch (IG) power supply | Engine switch on (IG) | 10 to 14 V |
| BDR (L10-6) - GND (L10-1) | L - W-B | Battery (ECU power source) | Always | 10 to 14 V |
If the result is not as specified, there may be a malfunction on the wire harness side.
Reconnect the L10 ECU connector.
Measure the voltage and resistance according to the value(s) in the table below.
| Symbols (Terminal No.) | Wiring Color | Terminal Description | Condition | Specified Condition |
| MSWE (L10-26) - GND (L10-1) | W - W-B | Ground for seat memory switch | Always | Below 1 Ω |
| MM (L10-25) - MSWE (L10-26) | Y - W | SET switch signal | SET switch OFF | 10 to 14 V |
| MM (L10-25) - MSWE (L10-26) | Y - W | SET switch signal | SET switch ON | Below 1 V |
| M1 (L10-22) - MSWE (L10-26) | O - W | M1 switch signal | M1 switch OFF | 10 to 14 V |
| M1 (L10-22) - MSWE (L10-26) | O - W | M1 switch signal | M1 switch ON | Below 1 V |
| M2 (L10-23) - MSWE (L10-26) | LG - W | M2 switch signal | M2 switch OFF | 10 to 14 V |
| M2 (L10-23) - MSWE (L10-26) | LG - W | M2 switch signal | M2 switch ON | Below 1 V |
| M3 (L10-24) - MSWE (L10-26) | R - W | M3 switch signal | M3 switch OFF | 10 to 14 V |
| M3 (L10-24) - MSWE (L10-26) | R - W | M3 switch signal | M3 switch ON | Below 1 V |
If the result is not as specified, the outer mirror control ECU RH may have a malfunction.
LEXUS IS250, IS220d / GSE20 ALE20