Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

READ VALUE OF HAND-HELD TESTER
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch to the ON position and turn the hand-held tester switch on.
3. Select the item below in the DATA LIST and read the display on the hand-held tester.
BODY NO. 2 (DRIVER SIDE JUNCTION BLOCK ECU):

Fig 1: Diagnostic Chart (Driver Side Junction Block ECU)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Condition sign can be displayed.
1. NG: Go to step 3
2. OK: Go to next step
PERFORM ACTIVE TEST USING HAND-HELD TESTER
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch to the ON position and turn the hand-held tester main switch on.
3. Select the items below in the ACTIVE TEST and then check the stop lamp operation.
BODY NO. 4 (LUGGAGE ROOM JUNCTION BLOCK ECU):

Fig 2: Diagnostic Chart (Luggage Room Junction Block ECU)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Each lamp comes on.
1. NG: Go to step 5
2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE PROBLEM SYMPTOMS TABLE )
CHECK HARNESS AND CONNECTOR (STOP LAMP SWITCH CIRCUIT)
1. Disconnect the D3 connector from the driver side junction block.
  Measure the voltage according to the value (s) in the figure Fig 3 below.
Standard:

Fig 3: Tester Connection Reference Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 4: Identifying Connector Terminal Of Driver Side Junction Block
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Go to step 4
2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE PROBLEM SYMPTOMS TABLE )
INSPECT STOP LAMP SWITCH ASSY
1. Measure the resistance according to the value (s) in the figure Fig 5 below.
Standard:

Fig 5: Resistance Reference Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 6: Inspecting Stop Lamp Switch Assy
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1. NG: REPLACE STOP LAMP SWITCH ASSY
2. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LAMP SWITCH CIRCUIT)
INSPECT LUGGAGE ROOM JUNCTION BLOCK ASSY
1. Measure the voltage according to the value (s) in the figure Fig 7 below.
HINT:

Inspect the side the suspected malfunctioning part is on.

Standard:

Fig 7: Tester Connection Reference Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 8: Identifying Connector Terminal Of Driver Side Junction Block
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Go to step 6
2. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (EACH OF STOP LAMP CIRCUIT)
INSPECT LUGGAGE ROOM JUNCTION BLOCK ASSY
1. Measure the voltage according to the value (s) in the figure Fig 9 below.
HINT:

Inspect the side the suspected malfunctioning part is on.

Standard:

Fig 9: Tester Connection Reference Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 10: Identifying Connector Terminal Of Driver Side Junction Block
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Go to step 9
2. OK: Go to next step
INSPECT LUGGAGE ROOM JUNCTION BLOCK ASSY
1. Disconnect the LA and LI connectors from the luggage room junction block assy.
Measure the resistance according to the value (s) in the figure Fig 11 below.

Standard:

Fig 11: Tester Connection Reference Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 12: Identifying Connector Terminal Of Driver Side Junction Block
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE LUGGAGE ROOM JUNCTION BLOCK ASSY
2. OK: Go to next step
CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT)
1. Measure the resistance according to the value (s) in the figure Fig 13 below.
Standard:

Fig 13: Tester Connection Reference Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 14: Identifying Connector Terminal Of Driver Side Junction Block
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)
2. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (EACH OF STOP LAMP CIRCUIT)
CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
1. Measure the voltage according to the value (s) in the figure Fig 15 below.
Standard:

Fig 15: Tester Connection Reference Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 16: Identifying Connector Terminal Of Driver Side Junction Block
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE PROBLEM SYMPTOMS TABLE )