LIN Communication System (Diagnostic Codes): Diagnosis Lexus CT I

INSPECTION PROCEDURE

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure. When using the Techstream to troubleshoot with the power switch off: Connect the Techstream to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.

Scheme 103

1. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Remove the instrument panel junction block assembly. Refer to «REMOVAL»(ref-568756-S16773882952013072300000) . Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly. Measure the resistance according to the value(s) in the table below. HINT: This inspection is to check the LIN line in the instrument panel junction block assembly that connects the wire harness to the built-in main body ECU (multiplex network body ECU). Standard Resistance Tester Connection Condition Specified Condition 2A-27 (LIN2) - MB-16 (LIN2) Always Below 1 ohms 2A-27 (LIN2) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *a Component without harness connected (Instrument Panel Junction Block Assembly) *b Component without harness connected (Instrument Panel Junction Block Assembly) NG --> See step 6 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - MULTIPLEX NETWORK MASTER SWITCH) Disconnect the K5 multiplex network master switch assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2A-27 (LIN2) - K5-17 (LIN1) Always Below 1 ohms 2A-27 (LIN2) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH - BATTERY, BODY GROUND) Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition K5-11 (B) - K5-12 (GND) Power switch off 11 to 14 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition K5-12 (GND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY Replace the multiplex network master switch assembly. Refer to «REMOVAL»(ref-568822-S15854171672013072300000) . NEXT: Go to next step
5. CHECK DTC OUTPUT Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-568820-S20386481962013072300000) . Recheck for DTCs. OK DTC B1206 is not output. NG --> See step 7 OK --> END (MULTIPLEX NETWORK MASTER SWITCH WAS DEFECTIVE)
6. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to «REMOVAL»(ref-568756-S16773882952013072300000)
7. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(ref-568756-S16773882952013072300000)

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure. When the sliding roof ECU (sliding roof drive gear assembly) is replaced or removed and reinstalled, it requires initialization. Refer to INITIALIZATION . When using the Techstream to troubleshoot with the power switch off: Connect the Techstream to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.

Note. If the certification ECU (smart key ECU assembly) is replaced, register the key. Refer to REGISTRATION . When using the Techstream to troubleshoot with the power switch off: Connect the Techstream to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure. When a power window regulator motor assembly is replaced or removed and reinstalled, it requires initialization. Refer to INITIALIZATION . When using the Techstream to troubleshoot with the power switch off: Connect the Techstream to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.

Scheme 104

1. CHECK DTC OUTPUT Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-568820-S20386481962013072300000) . Recheck for DTCs. Result Result Proceed to Only DTC B2321 is output. A DTC B1206 and B2321 are output simultaneously. B HINT: When DTC B1206 and B2321 are output simultaneously, perform troubleshooting for DTC B1206 first. B --> See step 9 A: Go to next step
2. CHECK HARNESS AND CONNECTOR (MASTER SWITCH - DRIVER SIDE POWER WINDOW REGULATOR MOTOR) Disconnect the K5 multiplex network master switch connector. Disconnect the K2 power window regulator motor (for driver side) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition K5-16 (LIN2) - K2-9 (LIN) Always Below 1 ohms K5-16 (LIN2) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. INSPECT MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY Remove the multiplex network master switch assembly. Refer to «REMOVAL»(ref-568822-S15854171672013072300000) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 16 (LIN2) - 17 (LIN1) Always Below 1 ohms 16 (LIN2) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *a Component without harness connected (Multiplex Network Master Switch Assembly) NG --> See step 7 OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR MOTOR - BATTERY, BODY GROUND) Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition K2-2 (B) - Body ground Power switch off 11 to 14 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition K2-1 (GND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for DRIVER SIDE) Replace the power window regulator motor assembly (for driver side). Refer to «REMOVAL»(ref-568822-S30825573362013072300000) . NEXT: Go to next step
6. CHECK DTC OUTPUT Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-568820-S20386481962013072300000) . Check for DTCs. OK DTC B2321 is not output. NG --> See step 8 OK --> END (POWER WINDOW REGULATOR MOTOR ASSEMBLY WAS DEFECTIVE)
7. REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY. Refer to «REMOVAL»(ref-568822-S15854171672013072300000)
8. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(ref-568756-S16773882952013072300000)
9. GO TO DTC B1206. Refer to «DTC B1206: P/W Master Switch Communication Stop»(ref-568821-S11563524522013072300000)

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure. When a power window regulator motor assembly is replaced or removed and reinstalled, it requires initialization. Refer to INITIALIZATION . When using the Techstream to troubleshoot with the power switch off: Connect the Techstream to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure. When a power window regulator motor assembly is replaced or removed and reinstalled, it requires initialization. Refer to INITIALIZATION . When using the Techstream to troubleshoot with the power switch off: Connect the Techstream to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure. When a power window regulator motor assembly is replaced or removed and reinstalled, it requires initialization. Refer to INITIALIZATION . When using the Techstream to troubleshoot with the power switch off: Connect the Techstream to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.

Scheme 105

1. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Remove the instrument panel junction block assembly. Refer to «REMOVAL»(ref-568756-S16773882952013072300000) . Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly. Measure the resistance according to the value(s) in the table below. HINT: This inspection is to check the LIN line in the instrument panel junction block assembly that connects the wire harness to the built-in main body ECU (multiplex network body ECU). Standard Resistance Tester Connection Condition Specified Condition 2D-26 (LIN2) - MB-16 (LIN2) Always Below 1 ohms 2D-26 (LIN2) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *a Component without harness connected (Instrument Panel Junction Block Assembly) *b Component without harness connected (Instrument Panel Junction Block Assembly) NG --> See step 6 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - POWER WINDOW REGULATOR MOTOR) Disconnect the M2 power window regulator motor assembly (for rear LH side) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2D-26 (LIN2) - M2-9 (LIN) Always Below 1 ohms 2D-26 (LIN2) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR MOTOR - BATTERY, BODY GROUND) Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition M2-2 (B) - Body ground Power switch off 11 to 14 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition M2-1 (GND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for REAR LH SIDE) Replace the power window regulator motor assembly (for rear LH side). Refer to «REMOVAL»(ref-568822-S05144635192013072300000) . NEXT: Go to next step
5. CHECK DTC OUTPUT Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-568820-S20386481962013072300000) . Check for DTCs. OK DTC B2324 is not output. NG --> See step 7 OK --> END (POWER WINDOW REGULATOR MOTOR ASSEMBLY WAS DEFECTIVE)
6. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to «REMOVAL»(ref-568756-S16773882952013072300000)
7. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(ref-568756-S16773882952013072300000)

Note. When the sliding roof ECU (sliding roof drive gear assembly) is replaced or removed and reinstalled, it requires initialization. Refer to INITIALIZATION . When a power window regulator motor assembly is replaced or removed and reinstalled, it requires initialization. Refer to INITIALIZATION . When using the Techstream to troubleshoot with the power switch off: Connect the Techstream to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.

Scheme 106

1. CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR MOTOR (DRIVER SIDE) - MASTER SWITCH) Disconnect the K5 multiplex network master switch connector. Disconnect the K2 power window regulator motor (for driver side) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition K5-16 (LIN2) - K2-9 (LIN) Always Below 1 ohms K5-16 (LIN2) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
2. INSPECT MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY Remove the multiplex network master switch assembly. Refer to «REMOVAL»(ref-568822-S15854171672013072300000) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 16 (LIN2) - 17 (LIN1) Always Below 1 ohms 16 (LIN2) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *a Component without harness connected (Multiplex Network Master Switch Assembly) NG --> See step 14 OK: Go to next step
3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Remove the instrument panel junction block assembly. Refer to «REMOVAL»(ref-568756-S16773882952013072300000) . Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly. Measure the resistance according to the value(s) in the table below. HINT: This inspection is to check the LIN line in the instrument panel junction block assembly that connects the wire harness to the built-in main body ECU (multiplex network body ECU). Standard Resistance Tester Connection Condition Specified Condition 2D-26 (LIN2) - MB-16 (LIN2) Always Below 1 ohms 2A-27 (LIN2) - MB-16 (LIN2) Always Below 1 ohms 2A-27 (LIN2) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *a Component without harness connected (Instrument Panel Junction Block Assembly) *b Component without harness connected (Instrument Panel Junction Block Assembly) *c Component without harness connected (Instrument Panel Junction Block Assembly) - - NG --> See step 11 OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (INSTRUMENT JUNCTION BLOCK - EACH ECU) Disconnect the J2, T10*1, L2 and M2 connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2D-26 (LIN2) - M2-9 (LIN) Always Below 1 ohms 2A-27 (LIN2) - L2-9 (LIN) Always Below 1 ohms 2A-27 (LIN2) - K5-17 (LIN1) Always Below 1 ohms 2A-27 (LIN2) - J2-9 (LIN) Always Below 1 ohms 2A-27 (LIN2) - T10-4 (LIN)*1 Always Below 1 ohms 2D-26 (LIN2) - Body ground Always 10 kohms or higher 2A-27 (LIN2) - Body ground Always 10 kohms or higher *1: w/ Sliding Roof System NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK DTC OUTPUT (POWER WINDOW REGULATOR MOTOR ASSEMBLY (for REAR LH SIDE)) Reconnect the K5, 2A, 2D, T10*1, L2, K2 and J2 connectors. *1: w/ Sliding Roof System Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-568820-S20386481962013072300000) . After 10 seconds have elapsed, check if the trouble occurs again. Check for DTCs again. Result Result Proceed to DTC B2325 is output A DTC B2325 is not output B B --> See step 12 A: Go to next step
6. CHECK DTC OUTPUT (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY) Reconnect the M2 connector. Disconnect the K5 connector. Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-568820-S20386481962013072300000) . After 10 seconds have elapsed, check if the trouble occurs again. Check for DTCs again. Result Result Proceed to DTC B2325 is output A DTC B2325 is not output B B --> See step 14 A: Go to next step
7. CHECK DTC OUTPUT (POWER WINDOW REGULATOR MOTOR ASSEMBLY (for REAR RH SIDE)) Reconnect the K5 connector. Disconnect the L2 connector. Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-568820-S20386481962013072300000) . After 10 seconds have elapsed, check if the trouble occurs again. Check for DTCs again. Result Result Proceed to DTC B2325 is output A DTC B2325 is not output B B --> See step 15 A: Go to next step
8. CHECK DTC OUTPUT (POWER WINDOW REGULATOR MOTOR ASSEMBLY (for DRIVER SIDE)) Reconnect the L2 connector. Disconnect the K2 connector. Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-568820-S20386481962013072300000) . After 10 seconds have elapsed, check if the trouble occurs again. Check for DTCs again. Result Result Proceed to DTC B2325 is output A DTC B2325 is not output B B --> See step 16 A: Go to next step
9. CHECK DTC OUTPUT (POWER WINDOW REGULATOR MOTOR ASSEMBLY (for FRONT PASSENGER SIDE)) Reconnect the K2 connector. Disconnect the J2 connector. Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-568820-S20386481962013072300000) . After 10 seconds have elapsed, check if the trouble occurs again. Check for DTCs again. Result Result Proceed to DTC B2325 is output (w/ Sliding Roof System) A DTC B2325 is output (w/o Sliding Roof System) B DTC B2325 is not output C B --> See step 18 C --> See step 17 A: Go to next step
10. CHECK DTC OUTPUT (SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY)) Reconnect the J2 connector. Disconnect the T10 connector. Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-568820-S20386481962013072300000) . After 10 seconds have elapsed, check if the trouble occurs again. Check for DTCs again. Result Result Proceed to DTC B2325 is output A DTC B2325 is not output B B --> See step 13 A --> See step 18
11. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to «REMOVAL»(ref-568756-S16773882952013072300000)
12. REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for REAR LH SIDE). Refer to «REMOVAL»(ref-568822-S05144635192013072300000)
13. REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY). Refer to «REMOVAL»(ref-568823-S18934771192013072300000)
14. REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY. Refer to «REMOVAL»(ref-568822-S15854171672013072300000)
15. REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for REAR RH SIDE). Refer to «REMOVAL»(ref-568822-S05144635192013072300000)
16. REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for DRIVER SIDE). Refer to «REMOVAL»(ref-568822-S30825573362013072300000)
17. REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for FRONT PASSENGER SIDE). Refer to «REMOVAL»(ref-568822-S30825573362013072300000)
18. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(ref-568756-S16773882952013072300000)

Note. If the certification ECU (smart key ECU assembly) is replaced, register the key. Refer to REGISTRATION . If the transmission control ECU assembly is replaced, register the ECU code. Refer to REGISTRATION . If the ID code box (immobilizer code ECU) is replaced, register the ECU code and ECU communication ID. Refer to REGISTRATION . When using the Techstream to troubleshoot with the power switch off: Connect the Techstream to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.

HINT

Although "No Response from Steering Lock ECU" is displayed on the Techstream, this message is shown if the certification ECU (smart key ECU assembly) cannot communicate with the transmission control ECU assembly.

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure. If the certification ECU (smart key ECU assembly) is replaced, register the key. Refer to REGISTRATION . If the transmission control ECU assembly is replaced, register the ECU code. Refer to REGISTRATION . When using the Techstream to troubleshoot with the power switch off: Connect the Techstream to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure. If the certification ECU (smart key ECU assembly) is replaced, register the key. Refer to REGISTRATION . If the ID code box (immobilizer code ECU) is replaced, register the ECU code and ECU communication ID. Refer to REGISTRATION . When using the Techstream to troubleshoot with the power switch off: Connect the Techstream to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure. If the certification ECU (smart key ECU assembly) is replaced, register the key. Refer to REGISTRATION . When using the Techstream to troubleshoot with the power switch off: Connect the Techstream to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.