Lexus Link System (Diagnostic Codes & Circuit Tests): Overview — Lexus GS III рестайлинг (2007-2011)

DESCRIPTION

This DTC is output when the LEXUS Link service cannot be received.

DTC No.	DTC Detection Condition	Trouble Area
1-1	LEXUS Link service cannot be received	No problem

This DTC is output if the mayday ECU has a writing error while downloading information from the LEXUS Link call center.

DTC No.	DTC Detection Condition	Trouble Area
1-2	Mayday ECU has writing error of information from LEXUS Link call center	Mayday ECU

These DTCs are output when an error occurs in the CPU of the mayday ECU.

DTC No.	DTC Detection Condition	Trouble Area
2-1	Internal communication error in mayday ECU	Mayday ECU
2-2	Checksum error in mayday ECU	Mayday ECU

Note. Current DTC Historic DTC only Disconnect and reconnect battery. Check for current DTCs. If DTC returns, replace mayday ECU and mayday battery (backup battery). If this is only a historic DTC, the system has already recovered normally and should be operating normally. Clear historic DTCs.

These DTCs are output when a communication error occurs between the CPU and each interface in the mayday ECU.

DTC No.	DTC Detection Condition	Trouble Area
2-3	DSP interface communication error in mayday ECU	Mayday ECU
2-4	GPS interface communication error in mayday ECU	Mayday ECU

This DTC is output when a communication error occurs between the CPU and each interface in the mayday ECU.

DTC No.	DTC Detection Condition	Trouble Area
2-6	Telephone interface communication error in mayday ECU	Mayday ECU

Note. Current DTC Historic DTC only Disconnect and reconnect battery. Wait 5 minutes with power switch ON (IG). Check DTCs. If DTC is not set, place a test phone call. If DTC 2-6 is set, replace mayday ECU and mayday battery (backup battery). If this is only a historic DTC, the system has already recovered normally and should be operating normally. Place a test call to verify functionality and then clear historic DTCs.

This DTC is output when one of the following occurs: 1) the mayday ECU is malfunctioning; 2) the telephone antenna (GPS antenna) is malfunctioning; or 3) the antenna cord is malfunctioning.

DTC No.	DTC Detection Condition	Trouble Area
3-1	Communication or communication line is abnormal between mayday ECU and telephone antenna (GPS antenna)	Mayday ECU Telephone antenna assembly (GPS antenna) Antenna cord sub-assembly

Scheme 214

Scheme 214: WIRING DIAGRAM

Scheme 215

Scheme 215: PROCEDURE

Scheme 216

INSPECT TELEPHONE ANTENNA ASSEMBLY (GPS ANTENNA) AND ANTENNA CORD SUB-ASSEMBLY Disconnect the antenna cord connector from the ECU. Measure the resistance of the connector. Standard resistance Tester Connection Specified Condition 1 (SIGNAL) - Body ground 50 to 500 ohms OK --> See step 3 NG: Go to next step
INSPECT ANTENNA CORD SUB-ASSEMBLY Disconnect the antenna cord connector from the ECU. Disconnect the antenna cord connector from the telephone antenna. Measure the resistance of the antenna cord. Standard resistance Tester Connection Specified Condition 1 (SIGNAL) - 1 Below 1 ohms Either terminal 1 - Body ground 10 kohms or higher NG --> REPLACE ANTENNA CORD SUB-ASSEMBLY THEN CLEAR HISTORIC DTC OK: Go to next step
CHECK OPERATION OF MAYDAY ECU Temporarily replace the mayday ECU and mayday battery with a new one. Check for the current DTC again. OK System operates normally (red LED off). NG Current DTC 3-1 exists NG --> REPLACE TELEPHONE ANTENNA ASSEMBLY (GPS ANTENNA) THEN CLEAR HISTORIC DTC OK --> END (MAYDAY ECU IS FAULTY; PERFORM REGISTRATION)

This DTC is output when one of the following occurs: 1) the mayday ECU is malfunctioning; 2) the telephone antenna (cellular phone antenna) is malfunctioning; or 3) the antenna cord is malfunctioning.

DTC No.	DTC Detection Condition	Trouble Area
3-2	Communication or communication line is abnormal between mayday ECU and telephone antenna (cellular phone antenna)	Mayday ECU Telephone antenna assembly (Cellular phone antenna) Antenna cord sub-assembly

Scheme 217

Scheme 217: WIRING DIAGRAM

Scheme 218

Scheme 218: PROCEDURE

Scheme 219

INSPECT TELEPHONE ANTENNA ASSEMBLY AND ANTENNA CORD SUB-ASSEMBLY Disconnect the antenna connector from the ECU. Measure the resistance of the connector. Standard resistance Tester Connection Specified Condition 1 (SIGNAL) - Body ground 4 to 11 kohms OK --> See step 3 NG: Go to next step
INSPECT ANTENNA CORD SUB-ASSEMBLY Disconnect the antenna cord connector from the ECU. Disconnect the antenna cord connector from the telephone antenna. Measure the resistance of the antenna cord. Standard resistance Tester Connection Specified Condition 1 (SIGNAL) - 1 Below 1 ohms Either terminal 1 - Body ground 10 kohms or higher NG --> REPLACE ANTENNA CORD SUB-ASSEMBLY THEN CLEAR HISTORIC DTC OK: Go to next step
CHECK OPERATION OF MAYDAY ECU Temporarily replace the mayday ECU and mayday battery with a new one. Check for DTC again. OK System operates normally (red LED off). NG Current DTC 3-2 exists NG --> REPLACE TELEPHONE ANTENNA ASSEMBLY THEN CLEAR HISTORIC DTC OK --> END (MAYDAY ECU IS FAULTY; PERFORM REGISTRATION)

This DTC is output when the telephone antenna (GPS antenna) cannot receive information on the current location of the vehicle from the GPS satellite while driving for short distance.

DTC No.	DTC Detection Condition	Trouble Area
3-3	Telephone antenna (GPS antenna) cannot receive GPS data for short distance	Location or service area Telephone antenna assembly (GPS antenna)

This DTC is output when one of the following occurs: 1) the mayday ECU is malfunctioning; 2) the red LED is malfunctioning; or 3) the wire harness between the mayday ECU and the map light (mayday switch ) is open or short.

DTC No.	DTC Detection Condition	Trouble Area
4-1	Communication or communication line is abnormal between mayday ECU and map light (mayday switch)	Mayday ECU Map light assembly Mayday switch assembly Wire harness

Scheme 220

Scheme 220: WIRING DIAGRAM

Scheme 221

Scheme 221: PROCEDURE

CHECK WIRE HARNESS (MAYDAY ECU - MAP LIGHT (MAYDAY SWITCH)) Disconnect the U46 ECU connector. Disconnect the W8 map light connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition U46-4 (IND1) - W8-6 (IND1) Below 1 ohms U46-4 (IND1) or W8-6 (IND1) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS AND CONNECTOR THEN CLEAR HISTORIC DTC OK: Go to next step
CHECK OPERATION OF MAYDAY SWITCH ASSEMBLY (RED LED) Temporarily replace the mayday switch with a new or normally functioning one. Check that the system operates normally. OK Red LED operates normally. OK --> END (MAYDAY SWITCH (RED LED) IS FAULTY; CLEAR HISTORIC DTC) NG: Go to next step
CHECK OPERATION OF MAP LIGHT ASSEMBLY Temporarily replace the map light with a new or normally functioning one. Check that the system operates normally. OK Red LED operates normally. NG --> REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION OK --> END (MAP LIGHT IS FAULTY; CLEAR HISTORIC DTC)

This DTC is output when one of the following occurs: 1) the mayday ECU is malfunctioning; 2) the green LED is malfunctioning; or 3) the wire harness between the mayday ECU and the map light (mayday switch) is open or short.

DTC No.	DTC Detection Condition	Trouble Area
4-2	Communication or communication line is abnormal between mayday ECU and map light (mayday switch)	Mayday ECU Map light assembly Mayday switch assembly Wire harness

Scheme 222

Scheme 222: WIRING DIAGRAM

Scheme 223

Scheme 223: PROCEDURE

CHECK WIRE HARNESS (MAYDAY ECU - MAP LIGHT (MAYDAY SWITCH)) Disconnect the U46 ECU connector. Disconnect the W8 map light connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition U46-11 (IND2) - W8-5 (IND2) Below 1 ohms U46-11 (IND2) or W8-5 (IND2) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS AND CONNECTOR THEN CLEAR HISTORIC DTC OK: Go to next step
CHECK OPERATION OF MAYDAY SWITCH ASSEMBLY (GREEN LED) Temporarily replace the mayday switch with a new or normally functioning one. Check that the system operates normally. OK Green LED operates normally. OK --> END (MAYDAY SWITCH (GREEN LED) IS FAULTY; CLEAR HISTORIC DTC) NG: Go to next step
CHECK OPERATION OF MAP LIGHT ASSEMBLY Temporarily replace the map light with a new or normally functioning one. Check that the system operates normally. OK Green LED operates normally. NG --> REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION OK --> END (MAP LIGHT IS FAULTY; CLEAR HISTORIC DTC)

This DTC is output when one of the following occurs: 1) the mayday ECU is malfunctioning; 2) the map light assembly is malfunctioning; 3) the microphone amplifier is malfunctioning; or 4) the wire harness between the mayday ECU and the map light is open or short.

DTC No.	DTC Detection Condition	Trouble Area
4-3	Communication or communication line is abnormal between mayday ECU and microphone amplifier (located in map light assembly)	Mayday ECU Microphone amplifier assembly Map light assembly Wire harness

Scheme 224

Scheme 224: WIRING DIAGRAM

Scheme 225

Scheme 225: PROCEDURE

Scheme 226

CHECK NAVIGATION SYSTEM Start the navigation system and check that the voice recognition microphone function operates normally. If the microphone function is normal, proceed to A. If the microphone function is malfunctioning, proceed to B. B --> GO TO NAVIGATION SYSTEM A: Go to next step
CHECK WIRE HARNESS (MAYDAY ECU - MAP LIGHT) Disconnect the U45 ECU connector. Disconnect the W6 map light connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition U45-7 (MCVD) - W6-19 (ACC) Below 1 ohms U45-7 (MCVD) or W6-19 (ACC) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS AND CONNECTOR THEN CLEAR HISTORIC DTC OK: Go to next step
CHECK WIRE HARNESS (MAP LIGHT - BODY GROUND) Disconnect the W6 map light connector. Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Specified Condition W6-31 (GND3) - Body ground Below 1 ohms NG --> REPAIR OR REPLACE HARNESS AND CONNECTOR THEN CLEAR HISTORIC DTC OK: Go to next step
CHECK OPERATION OF MAP LIGHT ASSEMBLY Temporarily replace the map light with a new or normally functioning one. Check that the DTC 4-3 is output. OK DTC 4-3 is not output. NG --> REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION OK --> END (MAP LIGHT IS FAULTY; CLEAR HISTORIC DTC)

This DTC is output when one of the following occurs: 1) the mayday ECU is malfunctioning; 2) the map light assembly is malfunctioning; or 3) the mayday switch is malfunctioning.

DTC No.	DTC Detection Condition	Trouble Area
4-4	Communication is abnormal between mayday ECU and map light or mayday switch	Mayday ECU Map light assembly Mayday switch assembly

Scheme 227

Scheme 227: PROCEDURE

Scheme 228

CHECK MAYDAY SWITCH ASSEMBLY Check that the mayday switch is not stuck by pressing the switch several times. Check for DTC again. OK Current DTC 4-4 is not output. OK --> CLEAR HISTORIC DTC NG: Go to next step
INSPECT MAYDAY SWITCH ASSEMBLY Remove the map light. Remove the mayday switch from the map light. Measure the resistance of the switch when each switch is pressed. Standard resistance Tester Connection Switch Condition Specified Condition 1 (SIG2) - 8 (SIG-) SERVICES button is pressed 305 to 313 ohms 1 (SIG2) - 8 (SIG-) PHONE button is pressed 812 to 831 ohms 1 (SIG2) - 8 (SIG-) PTT button is pressed 1811 to 1848 ohms NG --> REPLACE MAYDAY SWITCH ASSEMBLY THEN CLEAR HISTORIC DTC OK: Go to next step
INSPECT MAP LIGHT ASSEMBLY Install the mayday switch to the map light. Measure the resistance of the switch when each switch is pressed. Standard resistance Tester Connection Switch Condition Specified Condition 2 (SIG2) - 7 (SIG-) SERVICES button is pressed 305 to 313 ohms 2 (SIG2) - 7 (SIG-) PHONE button is pressed 812 to 831 ohms 2 (SIG2) - 7 (SIG-) PTT button is pressed 1811 to 1848 ohms NG --> REPLACE MAP LIGHT ASSEMBLY THEN CLEAR HISTORIC DTC OK --> REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION

This DTC is output when one of the following occurs: 1) the mayday ECU is malfunctioning; 2) the map light assembly is malfunctioning; or 2) the mayday switch is malfunctioning.

DTC No.	DTC Detection Condition	Trouble Area
4-5	Communication is abnormal between mayday ECU and map light or mayday switch	Mayday ECU Map light assembly Mayday switch assembly

Scheme 229

Scheme 229: PROCEDURE

Scheme 230

CHECK MAYDAY SWITCH ASSEMBLY Check that the mayday switch is not stuck by pressing the switch several times. Check for DTC again. OK Current DTC 4-5 is not output. OK --> CLEAR HISTORIC DTC NG: Go to next step
INSPECT MAYDAY SWITCH ASSEMBLY Remove the map light. Remove the mayday switch from the map light. Measure the resistance of the switch when each switch is pressed. Standard resistance Tester Connection Switch Condition Specified Condition 3 (SIG1) - 8 (SIG-) EMERGENCY button is pressed 305 to 313 ohms 3 (SIG1) - 8 (SIG-) VOL+ button is pressed 812 to 831 ohms 3 (SIG1) - 8 (SIG-) VOL- button is pressed 1811 to 1848 ohms NG --> REPLACE MAYDAY SWITCH ASSEMBLY THEN CLEAR HISTORIC DTC OK: Go to next step
INSPECT MAP LIGHT ASSEMBLY Install the mayday switch to the map light. Measure the resistance of the switch when each switch is pressed. Standard resistance Tester Connection Switch Condition Specified Condition 3 (SIG1) - 7 (SIG-) EMERGENCY button is pressed 305 to 313 ohms 3 (SIG1) - 7 (SIG-) VOL+ button is pressed 812 to 831 ohms 3 (SIG1) - 7 (SIG-) VOL- button is pressed 1811 to 1848 ohms NG --> REPLACE MAP LIGHT ASSEMBLY THEN CLEAR HISTORIC DTC OK --> REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION

This DTC is output when one of the following occurs: 1) the mayday ECU is malfunctioning; 2) the map light assembly is malfunctioning; 3) the mayday switch is malfunctioning; or 4) the wire harness between the mayday ECU and the map light is open.

DTC No.	DTC Detection Condition	Trouble Area
4-6	Communication or communication line is abnormal between mayday ECU and map light or mayday switch	Mayday ECU Map light assembly Mayday switch assembly Wire harness

Scheme 231

Scheme 231: WIRING DIAGRAM

Scheme 232

Scheme 232: PROCEDURE

CHECK WIRE HARNESS (MAYDAY ECU - MAP LIGHT (MAYDAY SWITCH)) Disconnect the U46 ECU connector. Disconnect the W8 map light connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition U46-13 (SIG2) - W8-2 (SIG2) Below 1 ohms U46-12 (SIG-) - W8-7 (GND) Below 1 ohms NG --> REPAIR OR REPLACE HARNESS AND CONNECTOR THEN CLEAR HISTORIC DTC OK: Go to next step
INSPECT MAYDAY SWITCH ASSEMBLY Remove the map light. Remove the mayday switch from the map light. Measure the resistance of the switch when each switch is pressed. Standard resistance Tester Connection Switch Condition Specified Condition 1 (SIG2) - 8 (SIG-) SERVICES button is pressed 305 to 313 ohms 1 (SIG2) - 8 (SIG-) PHONE button is pressed 812 to 831 ohms 1 (SIG2) - 8 (SIG-) PTT button is pressed 1811 to 1848 ohms NG --> REPLACE MAYDAY SWITCH ASSEMBLY THEN CLEAR HISTORIC DTC OK: Go to next step
INSPECT MAP LIGHT ASSEMBLY Install the mayday switch to the map light. Measure the resistance of the switch when each switch is pressed. Standard resistance Tester Connection Switch Condition Specified Condition 2 (SIG2) - 7 (SIG-) SERVICES button is pressed 305 to 313 ohms 2 (SIG2) - 7 (SIG-) PHONE button is pressed 812 to 831 ohms 2 (SIG2) - 7 (SIG-) PTT button is pressed 1811 to 1848 ohms NG --> REPLACE MAP LIGHT ASSEMBLY THEN CLEAR HISTORIC DTC OK --> REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION

DTC No.	DTC Detection Condition	Trouble Area
4-7	Communication or communication line is abnormal between mayday ECU and map light or mayday switch	Mayday ECU Map light assembly Mayday switch assembly Wire harness

Scheme 233

Scheme 233: WIRING DIAGRAM

Scheme 234

Scheme 234: PROCEDURE

Scheme 235

Scheme 236

CHECK WIRE HARNESS (MAYDAY ECU - MAP LIGHT (MAYDAY SWITCH)) Disconnect the U46 ECU connector. Disconnect the W8 map light connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition U46-5 (SIGI) - W8-3 (SIGI) Below 1 ohms U46-12 (SIG-) - W8-7 (GND) Below 1 ohms NG --> REPAIR OR REPLACE HARNESS AND CONNECTOR THEN CLEAR HISTORIC DTC OK: Go to next step
INSPECT MAYDAY SWITCH ASSEMBLY Remove the map light. Remove the mayday switch from the map light. Measure the resistance of the switch when each switch is pressed. Standard resistance Tester Connection Switch Condition Specified Condition 3 (SIGI) - 8 (SIG-) EMERGENCY button is pressed 305 to 313 ohms 3 (SIGI) - 8 (SIG-) VOL+ button is pressed 812 to 831 ohms 3 (SIGI) - 8 (SIG-) VOL- button is pressed 1811 to 1848 ohms NG --> REPLACE MAYDAY SWITCH ASSEMBLY THEN CLEAR HISTORIC DTC OK: Go to next step
INSPECT MAP LIGHT ASSEMBLY Install the mayday switch to the map light. Measure the resistance of the switch when each switch is pressed. Standard resistance Tester Connection Switch Condition Specified Condition 3 (SIGI) - 7 (SIG-) EMERGENCY button is pressed 305 to 313 ohms 3 (SIGI) - 7 (SIG-) VOL+ button is pressed 812 to 831 ohms 3 (SIGI) - 7 (SIG-) VOL- button is pressed 1811 to 1848 ohms NG --> REPLACE MAP LIGHT ASSEMBLY THEN CLEAR HISTORIC DTC OK --> REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION

This DTC is output when one of the following occurs: 1) the mayday ECU is malfunctioning; 2) the cowl side junction block RH (main body ECU RH) is malfunctioning; or 3) the BEAN line is open or short.

DTC No.	DTC Detection Condition	Trouble Area
5-1	Communication or communication line is abnormal between mayday ECU and other ECU	Mayday ECU Light control switch circuit Cowl side junction block RH (Main body ECU RH) Another BEAN line ECU Wire harness

Scheme 237

Scheme 237: WIRING DIAGRAM

This DTC is output when one of the following occurs: 1) the mayday ECU is malfunctioning; 2) the center airbag sensor is malfunctioning; or 3) the communication line is open or short.

DTC No.	DTC Detection Condition	Trouble Area
5-2	Communication or communication line is abnormal between mayday ECU and center airbag sensor	Mayday ECU Center airbag sensor assembly Wire harness

Scheme 238

Scheme 238: WIRING DIAGRAM

Scheme 239

Scheme 239: PROCEDURE

CHECK FOR DTC (BLINKING PATTERN) Turn the power switch from ON (IG) to OFF. Turn the power switch ON (IG) and wait for 10 seconds. Check for the DTC again and wait for 20 seconds. OK DTC 5-2 is not output. OK --> CLEAR HISTORIC DTC NG: Go to next step
CHECK SUPPLEMENTAL RESTRAINT SYSTEM Check for DTC using the Techstream. RESULT Result Proceed to Related to supplemental restraint system A No DTC B A --> GO TO SUPPLEMENTAL RESTRAINT SYSTEM B: Go to next step
CHECK WIRE HARNESS (MAYDAY ECU - CENTER AIRBAG SENSOR) Disconnect the cable from the negative (-) battery terminal and wait for 90 seconds. Disconnect the U45 ECU connector. Disconnect the K44 airbag sensor connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition U45-16 (GSW) - K44-24 (GSW3) Below 1 ohms U45-16 (GSW) or K44-24 (GSW3) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS AND CONNECTOR THEN CLEAR HISTORIC DTC OK --> REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION

This DTC is output when the mayday battery (backup battery) voltage decreases to a specified level.

DTC No.	DTC Detection Condition	Trouble Area
6-1	Backup battery voltage decreases to specified level	Mayday battery (backup battery)

This DTC is output when the vehicle battery voltage decreases to 9.0 V with the power switch ON (IG).

DTC No.	DTC Detection Condition	Trouble Area
6-2	Vehicle battery voltage decreases to 9.0 V	Vehicle battery ECU power source circuit

This DTC is output when the mayday battery (backup battery) has been used.

HINT

This DTC is only a historic DTC.

DTC No.	DTC Detection Condition	Trouble Area
6-3	Mayday battery (backup battery) has been used	No problem

After the power switch is turned ON (IG) and 10 seconds or more have passed, if the mayday ECU does not recognize the mayday battery (backup battery), this DTC is output.