Toyota Tacoma (2015-2018) Service Manual: Room Oscillator does not Recognize Key

DESCRIPTION

If code verification cannot be performed in the vehicle interior, there may be problems with the communication between the vehicle (indoor electrical key antenna assembly (front floor) or (rear floor)) and electrical key transmitter sub-assembly, or the certification ECU (smart key ECU assembly) may be malfunctioning. When the electrical key transmitter sub-assembly is brought into the vehicle, verification of the key ID code transmitted from the electrical key transmitter sub-assembly and the key ID code stored in the certification ECU (smart key ECU assembly) is performed. If verification cannot be performed or the codes do not match, the engine switch cannot be turned on (IG) and the engine cannot be started.

When a door is unlocked and the electrical key transmitter sub-assembly is brought into the vehicle, the certification ECU (smart key ECU assembly) activates the indoor electrical key antenna assembly which transmits radio waves to detect the electrical key transmitter sub-assembly. If the electrical key transmitter sub-assembly recognizes that it is in the detection area, it responds with the key ID code. This information is received by the indoor electrical key antenna and then sent to the certification ECU (smart key ECU assembly).

Radio Wave Interference:

Parameter Name

Cause of Problem and Countermeasure

Operating Engine Switch / Key RF Signal Interference

When the engine switch was operated, the electrical key transmitter sub-assembly could not be confirmed due to wave interference. Therefore, the output frequency was switched to the other channel (changed from channel 1 to channel 2 or from channel 2 to channel 1). If the cause of the malfunction has not been stored but any devices that can cause wave interference in the cabin have been removed and the room oscillator successfully recognizes the key, the possibility of wave interference is high.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1.	CHECK START OPERATION

(a) Using another registered electrical key transmitter sub-assembly, check that the engine starts.

Result

Result	Proceed to
Engine cannot be started	A
Engine can be started	B

B

END (ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY WAS DEFECTIVE)

A

2.	CHECK ENTRY LOCK OPERATION

(a) Check that the entry lock and unlock functions operate on each door.

HINT:

If the electrical key and TPMS receiver assembly is defective, code verification does not begin in the cabin and the entry lock and unlock functions do not operate.

Result

Result	Proceed to
All door entry functions operate normally (w/ Wireless Charging System)	A
All door entry functions operate normally (w/o Wireless Charging System)	B
All door entry functions does not operate normally	C

B

GO TO STEP 4

C

GO TO OTHER PROBLEM

A

3.	CHECK WIRELESS CHARGING SYSTEM

(a) Turn the wireless charging system off (See page ).

(b) Check that interior verification is normal.

HINT:

If the power source mode can be changed, interior verification is normal.

Result

Result	Proceed to
Interior verification is abnormal	A
Interior verification is normal	B

B

GO TO WIRELESS CHARGING SYSTEM

A

4.	CHECK PUSH-BUTTON START FUNCTION

(a) Remove the transmitter battery of the electrical key transmitter sub-assembly (See page ).

(b) With the brake pedal depressed, face the logo side of the electrical key transmitter sub-assembly towards the engine switch, hold the transmitter near the engine switch and then press the engine switch.

(c) When operating the engine switch, check whether the engine starts.

OK:

Engine starts.

Text in Illustration

*1	Engine Switch
*2	Electrical Key Transmitter Subassembly

NG

GO TO SMART KEY SYSTEM (FOR START FUNCTION)

OK

5.	CHECK WAVE ENVIRONMENT

(a) Install the transmitter battery to the electrical key transmitter sub-assembly (See page ).

(b) Bring the electrical key transmitter sub-assembly near the No. 1 indoor electrical key antenna assembly (front floor) and perform a smart key system check (See page ).

NOTICE:

Communication may not be possible if the electrical key transmitter sub-assembly is within 0.2 m (0.656 ft.) of the No. 1 indoor electrical key antenna assembly (front floor).

(c) Bring the electrical key transmitter sub-assembly near the No. 2 indoor electrical key antenna assembly (rear floor) and perform a smart key system check (See page ).

HINT:

Check that the customize status of the "Ignition Available Area" has been "All".

NOTICE:

Communication may not be possible if the electrical key transmitter sub-assembly is within 0.2 m (0.656 ft.) of the center of the No. 2 indoor electrical key antenna assembly (rear floor).

OK:

The engine starts when the electrical key transmitter sub-assembly is held near each indoor electrical key antenna assembly and the engine switch is pressed.

Result

Result	Proceed to
NG	A
OK	B

B

AFFECTED BY WAVE INTERFERENCE

A

6.	CHECK FOR DTC

(a) Check for DTCs (See page ).

OK:

DTCs are not output.

NG

GO TO DIAGNOSTIC TROUBLE CODE CHART

OK

7.	CHECK KEY DIAGNOSTIC MODE

(a) Check the following antennas in key diagnostic mode (See page ).

(b) Select either channel 1 or channel 2 and inspect key diagnostic mode for each channel.

(1) Check the No. 1 indoor electrical key antenna assembly (front floor). When the electrical key transmitter sub-assembly is at the inspection point, check that the wireless door lock buzzer sounds. Text in Illustration *a Inspection Point

(2) Check the No. 2 indoor electrical key antenna assembly (rear floor). When the electrical key transmitter sub-assembly is at the inspection point, check that the wireless door lock buzzer sounds. Text in Illustration *a Inspection Point HINT: Select either channel 1 or channel 2 and inspect key diagnostic mode for each channel. If the buzzer sounds with [CH1] displayed but not with [CH2], the electrical key transmitter subassembly cannot be detected by channel 2 due to a malfunction, such as wave interference. It is possible to check which indoor electrical key antenna assembly (front floor or rear floor) is operating by the sounding of the buzzer. When the wireless buzzer sounds for all indoor electrical key antenna assemblies, they can be judged as operating properly and a malfunction in the certification ECU (smart key ECU assembly), which performs verification, is suspected. When the wireless buzzer does not sound for all indoor electrical key antenna assemblies, it can be judged that the certification ECU (smart key ECU assembly), which controls the indoor electrical key antenna assemblies, is malfunctioning. Result Result Proceed to The wireless buzzer sounds/does not sound for all indoor electrical key antenna assemblies A The wireless buzzer does not sound for only the No. 1 indoor electrical key antenna assembly (front floor) B The wireless buzzer does not sound for only the No. 2 indoor electrical key antenna assembly (rear floor) C

A

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

C

GO TO STEP 12

B

8.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR))

(a) Disconnect the C29 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the N29 No. 1 indoor electrical key antenna assembly (front floor) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C29-21 (CLG5) - N29-1 (CLG)	Always	Below 1 Ω
C29-20 (CG5B) - N29-3 (CLGB)	Always	Below 1 Ω
C29-21 (CLG5) or N29-1 (CLG) - Body ground	Always	10 kΩ or higher
C29-20 (CG5B) or N29-3 (CLGB) - Body ground	Always	10 kΩ or higher

(d) Reconnect the C29 certification ECU (smart key ECU assembly) connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.	CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) OUTPUT TO NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR))

(a) Using an oscilloscope, check the waveform. OK: Tester Connection Switch Condition Tool Setting Specified Condition N29-1 (CLG) - N29-3 (CLGB) Procedure: Engine switch off Electrical key transmitter sub-assembly not inside vehicle Within 30 seconds of closing any door using the door outside handle 2 V/DIV., 500 ms/DIV. Pulse generation (See waveform 1) Text in Illustration *a Front view of wire harness connector (to No. 1 indoor Electrical Key Antenna (Front Floor)) *b Waveform 1 *c For 30 seconds after closing any door using the door outside handle *d 30 seconds or more have elapsed after closing any door using the door outside handle

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

OK

10.	REPLACE NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR)

(a) Temporarily replace the No. 1 indoor electrical key antenna assembly (front floor) with a new one (See page ).

NEXT

11.	CHECK KEY DIAGNOSTIC MODE

(a) Check the following antenna in key diagnostic mode (See page ).

(b) Select either channel 1 or channel 2 and inspect key diagnostic mode for each channel.

(1) Check the No. 1 indoor electrical key antenna assembly (front floor). When the electrical key transmitter sub-assembly is at either inspection point, check that the wireless buzzer sounds. HINT: Select either channel 1 or channel 2 and inspect key diagnostic mode for each channel. If the buzzer sounds with [CH1] displayed but not with [CH2], the electrical key transmitter sub-assembly cannot be detected by channel 2 due to a malfunction, such as wave interference. OK: Wireless buzzer sounds. Text in Illustration *a Inspection Point

OK

END (NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR) WAS DEFECTIVE)

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

12.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REARFLOOR))

(a) Disconnect the C28 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the N30 No. 2 indoor electrical key antenna assembly (rear floor) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C28-15 (CLG6) - N30-1 (CLG)	Always	Below 1 Ω
C28-14 (CG6B) - N30-3 (CLGB)	Always	Below 1 Ω
C28-15 (CLG6) or N30-1 (CLG) - Body ground	Always	10 kΩ or higher
C28-14 (CG6B) or N30-3 (CLGB) - Body ground	Always	10 kΩ or higher

(d) Reconnect the C28 certification ECU (smart key ECU assembly) connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

13.	CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REAR FLOOR))

(a) Using an oscilloscope, check the waveform. OK: Tester Connection Switch Condition Tool Setting Specified Condition N30-1 (CLG) - N30-3 (CLGB) Procedure: Engine switch off Electrical key transmitter sub-assembly not inside vehicle Within 30 seconds of closing any door using the door outside handle 2 V/DIV., 500 ms/DIV. Pulse generation (See waveform 1) Text in Illustration *a Front view of wire harness connector (to No. 2 indoor Electrical Key Antenna Assembly (Rear Floor)) *b Waveform 1 *c For 30 seconds after closing any door using the door outside handle *d 30 seconds or more have elapsed after closing any door using the door outside handle

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

OK

14.	REPLACE NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REAR FLOOR)

(a) Temporarily replace the No. 2 indoor electrical key antenna assembly (rear floor) with a new one (See page ).

NEXT

15.	CHECK KEY DIAGNOSTIC MODE

(a) Check the following antenna in key diagnostic mode (See page ).

(b) Select either channel 1 or channel 2 and inspect the diagnostic mode for each channel.

(1) Check the No. 2 indoor electrical key antenna assembly (rear floor). When the electrical key transmitter sub-assembly is at the inspection point, check that the wireless door lock buzzer sounds. HINT: Select either channel 1 or channel 2 and inspect key diagnostic mode for each channel. If the buzzer sounds with [CH1] displayed but not with [CH2], the electrical key transmitter subassembly cannot be detected by channel 2 due to a malfunction, such as wave interference. OK: Wireless buzzer sounds. Text in Illustration *a Inspection Point

OK

END (NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REAR FLOOR) WAS DEFECTIVE)

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)