Toyota Pick-ups/Land Cruiser/4Runner 1989-1996

Electronic Control Unit (ECU)



See Figures 1 and 2

The ECU is the electrical brain of the rear wheel anti-lock system. It interprets signals from the speed sensor and the deceleration sensor, determining if wheel lock-up is about to occur. The ECU output controls the solenoid relay which energizes the actuator solenoid.

Additionally, the ECU uses other input signals to determine system readiness and integrity. Should a fault be found, a fault code is assigned and stored in memory. The ECU will illuminate the REAR ANTI-LOCK warning lamp on the dashboard when a fault is noted. The ECU is located behind the glove box on the upper underside of the dash.

  1. Remove the 4 screws and 1 bolt holding the glove box in place and remove the glove box assembly.

Click image to see an enlarged view

Fig. Fig. 1: Remove the glove box assembly form the vehicle

  1. Remove the 2 screws and 1 nut holding the ECU in place. Gently pull the ECU down for access.

Click image to see an enlarged view

Fig. Fig. 2: Remove the retainers securing the ECU

  1. Make certain the ignition switch is OFF . Unplug the wiring connector from the ECU and remove the unit.

To install:
  1. With the ignition OFF , attach the ECU to the wire harness.
  3. Install the unit, tightening the nuts and bolts snugly.
  5. Reinstall the glove box.