LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2010 >> Tundra Base, 4.0 U >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 90 (4WD Control System / Transfer Case Control System (Inspection)) >> 4WD Control System / Transfer Case Control System >> Terminals Of Four Wheel Drive Control Ecu >> Terminals Of Ecu
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Terminals Of Ecu

WARNING: This page is about a different variant/trim than selected.
  1. CHECK 4WD CONTROL ECU 
    Fig 1: Identifying 4WD Control ECU Connector Terminals
    GTY203296Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance according to the value(s) in the table below.
      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      A25-1 (HL1) - A26-4 (GND) BE - W-B High-low transfer shift actuator limit switch Ignition switch ON
      4WD control switch 4H      		 Below 1.5 V
      Ignition switch ON
      4WD control switch 4L      		 10.5 to 14 V
      A25-2 (HL2) - A26-4 (GND) R - W-B High-low transfer shift actuator limit switch Ignition switch ON
      4WD control switch 4H      		 10.5 to 14 V
      Ignition switch ON
      4WD control switch 4L      		 Below 1.5 V
      A25-3 (HL3) - A26-4 (GND) GR - W-B High-low transfer shift actuator limit switch Ignition switch ON
      4WD control switch 4H      		 10.5 to 14 V
      Ignition switch ON
      1.5 seconds or less after 4WD HIGH to 4WD LOW switching operation      		 Below 1.5 V
      Ignition switch ON
      Over 1.5 seconds after 4WD HIGH to 4WD LOW switching operation      		 10.5 to 14 V
      A25-5 (TT) - A25-25 (TGND) L - P Temperature sensor Ignition switch ON 0 to 5 V
      A25-6 (TL1) - A26-4 (GND) V - W-B 2WD-4WD transfer shift actuator limit switch Ignition switch ON
      4WD control switch 2WD      		 Below 1.5 V
      Ignition switch ON
      4WD control switch 4H or 4L      		 10.5 to 14 V
      A25-8 (TL3) - A26-4 (GND) W - W-B 2WD-4WD transfer shift actuator limit switch Ignition switch ON
      4WD control switch 2WD      		 10.5 to 14 V
      Ignition switch ON
      4WD control switch 4L      		 Below 1.5 V
      A25-9 (DL1) - A26-4 (GND) LG - W-B A.D.D. actuator limit switch Ignition switch ON
      4WD control switch 2WD (A.D.D. actuator Free)      		 10.5 to 14 V
      Ignition switch ON
      4WD control switch 4H (A.D.D. actuator Lock)      		 Below 1.5 V
      A25-10 (DL2) - A26-4 (GND) R - W-B A.D.D. actuator limit switch Ignition switch ON
      4WD control switch 2WD (A.D.D. actuator Free)      		 Below 1.5 V
      Ignition switch ON
      4WD control switch 4H (A.D.D. actuator Lock)      		 10.5 to 14 V
      A25-11 (2-4) - A26-4 (GND) B - W-B 4WD control switch Ignition switch ON
      4WD control switch 2WD or 4H      		 Below 1.5 V
      Ignition switch ON
      4WD control switch 4L      		 10.5 to 14 V
      A25-13 (LO) - A26-4 (GND) P - W-B 4WD control switch Ignition switch ON
      4WD control switch 2WD      		 10.5 to 14 V
      Ignition switch ON
      4WD control switch 4H or 4L      		 Below 1.5 V
      A25-14 (4WD) - A26-4 (GND) SB - W-B 2WD-4WD transfer shift actuator 4WD detection switch Ignition switch ON
      4WD control switch 2WD      		 9.5 to 14 V
      Ignition switch ON
      4WD control switch 4H      		 Below 1.5 V
      A25-15 (ADD) - A26-4 (GND) W - W-B A.D.D. actuator A.D.D. detection switch Ignition switch ON
      4WD control switch 2WD      		 10 to 14 V
      Ignition switch ON
      4WD control switch 4H      		 Below 1.5 V
      A25-16 (NP) - A26-4 (GND) B - W-B 2WD-4WD transfer shift actuator neutral detection switch Ignition switch ON
      1.5 seconds or less after 4WD HIGH to 4WD LOW switching operation      		 Below 1.5 V
      Ignition switch ON
      Over 1.5 seconds after 4WD HIGH to 4WD LOW switching operation      		 10 to 14 V
      A25-19 (CANH) - A25-20 (CANL) BE - W CAN communication line Ignition switch OFF 54 to 69 Ω
      A25-21 (L4) - A26-4 (GND) Y - W-B Transfer 4LO signal Except 4WD control switch 4L 10 to 14 V
      Ignition switch ON
      4WD control switch 4L      		 Below 1.5 V
      A26-1 (DM1) - A26-4 (GND) W - W-B A. D. D. actuator motor Ignition switch ON
      4WD control switch 4H (During operation of A.D.D. actuator from Lock to Free)      		 10 to 14 V
      Ignition switch ON
      4WD control switch 4H (A.D.D. actuator Free)      		 Below 1.5 V
      A26-2 (HM1) - A26-4 (GND) GR - W-B High-low transfer shift actuator motor Ignition switch ON
      4WD control switch 4L → 4H (During operation of high-low transfer shift actuator motor from 4WD LOW to 4WD HIGH)      		 10 to 14 V
      Ignition switch ON
      4WD control switch 4L → 4H (High-low transfer shift actuator motor stopped)      		 Below 1.5 V
      A26-3 (IG) - A26-4 (GND) V - W-B IG power Ignition switch ON 11 to 14 V
      A26-4 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      A26-5 (DM2) - A26-4 (GND) Y - W-B A. D. D. actuator motor Ignition switch ON
      4WD control switch 4H (during operation of A.D.D. actuator from Free to Lock)      		 10 to 14 V
      Ignition switch ON
      4WD control switch 4H (A.D.D. actuator Lock)      		 Below 1.5 V
      A26-6 (HM2) - A26-4 (GND) P - W-B High-low transfer shift actuator motor Ignition switch ON
      4WD control switch 4H → 4L (During operation of high-low transfer shift actuator motor from 4WD HIGH to 4WD LOW)      		 10 to 14 V
      Ignition switch ON
      4WD control switch 4H → 4L (High-low transfer shift actuator motor stopped)      		 Below 1.5 V
      A26-7 (TM2) - A26-4 (GND) LG - W-B 2WD-4WD transfer shift actuator motor Ignition switch ON
      4WD control switch 4H → 2WD (During operation of 2WD-4WD transfer shift actuator motor from 4WD HIGH to 2WD)      		 10 to 14 V
      Ignition switch ON
      4WD control switch 4H → 2WD (2WD-4WD transfer shift actuator motor stopped)      		 Below 1.5 V
      A26-8 (TM1) - A26-4 (GND) R - W-B 2WD-4WD transfer shift actuator motor Ignition switch ON
      4WD control switch 2WD → 4H (During operation of 2WD-4WD transfer shift actuator motor from 2WD to 4WD HIGH)      		 10 to 14 V
      Ignition switch ON
      4WD control switch 2WD → 4H (2WD-4WD transfer shift actuator motor stopped)      		 Below 1.5 V
scientia non olet · About LEMON Manuals