GM Full Size Vans 1987-1997 Repair Guide

Electronic Control Unit (RWAL)

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REMOVAL & INSTALLATION



See Figure 1



Click image to see an enlarged view

Fig. Fig. 1: Electronic control unit and isolation/dump valve mounting location - RWAL

The ECU is not serviceable. Replace the unit only when defective.

Do not touch the electrical connections and pins or allow them to come in contact with brake fluid as this may damage the ECU.

  1. Disconnect the negative battery cable and ECU connectors.
  2.  
  3. Remove the ECU by prying the tab at the rear of the ECU and pulling it toward the front of the vehicle.
  4.  

To install:
  1. Install the ECU by sliding the unit into the bracket until the tab locks into the hole.
  2.  
  3. Connect the electrical connectors and negative battery cable.
  4.  

 
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