Inspection Procedure

READ DATA LIST (STOP LAMP SWITCH)
1. Check the DATA LIST for proper functioning of the stop lamp switch.
  ECM (Cruise control):
  
  Fig 1: Reading Data List (Stop Lamp Switch) Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: Display changes according to brake pedal operation described in Fig 1 above.
  
  HINT:
  - Stop lamp SW1 has a function to disconnect the connection (OFF) when the pedal is depressed. However, the hand-held tester displays ON, as the ECM performs control using reverse logic.
  - Stop lamp SW1 indicates the input of ST1- terminal, and stop lamp SW2 indicates the input of STP terminal.
1. NG: Go to step 2
2. OK: REPLACE ECM (See REPLACEMENT )

INSPECT STOP LAMP SWITCH ASSY

Disconnect the stop lamp switch connector.

Measure the resistance of the switch.

Standard:

STOP LAMP SWITCH ASSY SPECIFIED CONDITION

Tester Connection	Switch Condition	Specified Condition
1 - 2	Pin not pushed (Brake pedal depressed)	Below 1 ohms
3 - 4	Pin not pushed (Brake pedal depressed)	10 k ohms or higher
1 - 2	Pin pushed (Brake pedal released)	10 k ohm or higher
3 - 4	Pin pushed (Brake pedal released)	Below 1 ohms

Fig 2: Inspecting Stop Lamp Switch Assy

G02955000

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE STOP LAMP SWITCH ASSY (See BRAKE PEDAL SUB-ASSY )
OK: Go to next step.

CHECK WIRE HARNESS

Disconnect the E5 and E6 ECM connectors.
Turn the ignition switch ON.

Measure the voltage of the wire harness side connectors.

Standard:

E5 AND E6 ECM CONNECTORS SPECIFIED CONDITION

Tester Connection	Brake Pedal Condition	Specified Condition
E5-4 (STP) - Body ground	Depressed	10 to 14 V
E5-4 (STP) - Body ground	Released	Below 1 V
E6-8 (ST1-) - Body ground	Depressed	Below 1 V
E6-8 (ST1-) - Body ground	Released	10 to 14 V

Fig 3: Checking Wire Harness

G02955001

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: REPLACE ECM (See REPLACEMENT )