Inspection Procedure

WARNING: This page is about a different car, the 2006 Toyota Tundra and 2005 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

Inspect key unlock warning switch.

CHECK:

Check the continuity between the terminals.

Fig 1: Inspecting Key Unlock Warning Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

KEY UNLOCK WARNING SWITCH

Switch Position	Tester Connection	Specified Condition
Switch free (Key removed)	1 - 2	No continuity
Switch pushed (Key inserted)	1 - 2	Continuity

NG : Replace key unlock warning switch.
OK : Go to next step

Check harness and connector between TVIP ECU and key unlock warning switch.
PREPARATION:
1. Disconnect the T12 TVIP ECU connector.
2. Disconnect the U1 key unlock warning switch connector.
CHECK:

Check the continuity between the wire harness side connectors.

Fig 2: Checking Harness And Connector Between TVIP ECU And Key Unlock Warning Switch
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

Fig 3: TVIP ECU And Key Unlock Warning Switch Table
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG : Repair or replace harness and connector.
2. OK : Go to next step.
Check harness and connector between key unlock warning switch and body ground.
PREPARATION:

Disconnect the U1 key unlock warning switch connector.

CHECK:

Check the continuity between the U1 key unlock warning switch wire harness side connector and body ground.

Fig 4: Checking Harness And Connector Between Key Unlock Warning Switch And Body Ground
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

Fig 5: Key Unlock Warning Switch And Body Ground Table
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG : Repair or replace harness and connector.
2. OK : Replace TVIP ECU.