Inspection Procedure

WARNING: This page is about a different car, the 2002 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.

Check Voltage Between Terminal 1 And 3 Of Brake Inhibit Relay And Body Ground.
Preparation : Remove the brake inhibit relay from the connector.

Check :
1. Turn the ignition switch ON.
2. Measure the voltage between terminal 1 of brake inhibit relay harness side connector and body ground. See Fig 1.
OK : Voltage; 10-14 V.

Check : Measure the voltage between terminal 3 of brake inhibit relay harness side connector and body ground when the brake pedal is depressed.

OK : Voltage: 8-14 V.

Fig 1: Testing Brake Inhibit Relay Voltages
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG : Check and repair harness or connector.
2. OK : Go to next step.
Check Brake Inhibit Relay.
CHECK : Continuity between following terminals of brake inhibit relay. See Fig 2.

For OK : conditions, see Fig 3.

Fig 2: Testing Brake Inhibit Relay
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: Testing Brake Inhibit Relay Continuity Chart (1 Of 2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK:
1. Apply battery positive voltage between terminals 1 and 4.
2. Check continuity between terminals. For expected conditions, see Fig 4.
  
  Fig 4: Testing Brake Inhibit Relay Continuity Chart (2 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG : Replace brake inhibit relay.
2. OK : Go to step 3.
Check For Open And Short Circuit In Harness And Connector Between Brake Inhibit Relay And Skid Control ECU. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
1. NG : Repair or replace harness or connector.
2. OK : If the same code is still output after the DTC is deleted, check the contact condition of each connection. If the connections are normal, the ECU may be defective.