No Answer-Back: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Data List.
5. Read the Data List according to the display on the Techstream.
   MAIN BODY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   D-Door Lock Pos SW	Driver door lock position switch signal/LOCK or UNLOCK	ON: Driver side door is unlocked OFF: Driver side door is locked	-
   P-Door Lock Pos SW	Front passenger side door lock position switch signal/ON or OFF	ON: Front passenger side door is unlocked OFF: Front passenger side door is locked	-
   RR-Door Lock Pos SW	Rear right side door lock position switch signal/ON or OFF	ON: Rear right side door unlocked OFF: Rear right side door locked	-
   RL-Door Lock Pos SW	Rear left side door lock position switch signal/ON or OFF	ON: Rear left side door unlocked OFF: Rear left side door locked	-

   OK

   On the Techstream screen, the display changes between ON and OFF as shown in the chart above.

   Result

   Result	Proceed to
   OK	A
   NG (for Driver Side)	B (Refer to PROBLEM SYMPTOMS TABLE "Driver Door LOCK/UNLOCK Functions do not Operate" in the problem symptoms table)
   NG (for Front Passenger Side)	C (Refer to PROBLEM SYMPTOMS TABLE "Front Passenger Door LOCK/UNLOCK Functions do not Operate" in the problem symptoms table)
   NG (for Rear LH Side)	D (Refer to PROBLEM SYMPTOMS TABLE "Rear Door LH LOCK/UNLOCK Functions do not Operate" in the problem symptoms table)
   NG (for Rear RH Side)	E (Refer to PROBLEM SYMPTOMS TABLE "Rear Door RH LOCK/UNLOCK Functions do not Operate" in the problem symptoms table)

B → See step   12 

C → See step   12 

D → See step   12 

E → See step   12 

A: Go to next step 

1. Check the wireless door lock control functions by operating the transmitter switch.

   Result

   Result	Proceed to
   Wireless door lock functions are normal but hazard warning lights answer-back does not occur	A
   Wireless door lock functions are normal but wireless door lock buzzer answer-back does not occur	B
   Doors cannot be locked and unlocked using transmitter	C

B → See step   6 

C → See step   9 

A: Go to next step 

1. Check that the hazard warning lights flash continuously when the hazard warning signal switch is pressed.

   OK

   Hazard warning lights flash continuously.

NG → See step   10 

OK: Go to next step 

1. Replace the main body ECU with a known good one.

NEXT: Go to next step 

1. Check that the hazard warning lights flash continuously when the door control transmitter LOCK or UNLOCK switch is pressed.

   OK

   Hazard warning lights flash continuously.

NG → REPLACE CERTIFICATION ECU (SMART KEY ECU) 

OK → END (MAIN BODY ECU IS DEFECTIVE) 

1. Enter Active Test, using the Techstream to generate a control command, and then check that the wireless buzzer operates normally.
   MAIN BODY
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Wireless Buzzer	Wireless Door Lock Buzzer	ON/OFF	-

   OK

   Wireless buzzer turns ON/OFF.

NG → See step   7 

OK → REPLACE CERTIFICATION ECU (SMART KEY ECU) 

1. Measure the resistance according to the value(s) in the table below.
   Fig 1: Identifying Wireless Door Lock Buzzer Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1 - 2	Always	950 to 1050 Ω

   NOTE:

   When battery voltage is directly applied to the buzzer, the buzzer does not sound.

NG → See step   11 

OK: Go to next step 

1. Disconnect the E36 certification ECU connector and A42 wireless door lock buzzer connector.
   Fig 2: Identifying E36 Certification ECU And A42 Wireless Door Lock Buzzer Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E36-21 (BZR) - A42-1	Always	Below 1 Ω
   E36-21 (BZR) - Body ground	Always	10 kΩ or higher
   A42-2 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE CERTIFICATION ECU (SMART KEY ECU)