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

Communication Devices ~2357 words

PROCEDURE

  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 - SLIDING ROOF ECU) Disconnect the T10 sliding roof ECU (sliding roof drive gear assembly) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2A-27 (LIN2) - T10-4 (LIN) 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 (SLIDING ROOF ECU - BATTERY, BODY GROUND) Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition T10-1 (B) - T10-2 (E) 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 T10-2 (E) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  4. REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY) Replace the sliding roof ECU (sliding roof drive gear assembly). Refer to «REMOVAL»(ref-568823-S18934771192013072300000) . 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 B1273 is not output. NG --> See step 7 OK --> END (SLIDING ROOF ECU 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)
  1. CHECK DTC OUTPUT Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-568820-S20386481962013072300000) . Recheck for DTCs. HINT: Check the both "Smart Access" and "Power Source Control" DTCs. Result Result Proceed to Only DTC B2287 is output. A DTC B2287 and B2785 are output simultaneously. B HINT: When DTC B2287 and B2785 are output simultaneously, perform troubleshooting for DTC B2785 first. B --> See step 6 A: Go to next step
  2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - POWER MANAGEMENT CONTROL ECU) Disconnect the H4 power management control ECU and H1 certification ECU (smart key ECU assembly) connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H4-11 (LIN2) - H1-29 (LIN) Always Below 1 ohms H4-11 (LIN2) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  3. REPLACE POWER MANAGEMENT CONTROL ECU Replace the power management control ECU. Refer to «REMOVAL»(ref-568756-S19873439732013072300000) . NEXT: Go to next step
  4. CHECK DTC OUTPUT Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-568820-S20386481962013072300000) . Recheck for DTCs. OK DTC B2287 is not output. NG --> See step 5 OK --> END (POWER MANAGEMENT CONTROL ECU WAS DEFECTIVE)
  5. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to «REMOVAL»(ref-568797-S38879700432013072300000)
  6. GO TO DTC B2785. Refer to «DTC B2785: Communication Malfunction between ECUs Connected by LIN»(ref-568821-S33656903032013072300000)
  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 - POWER WINDOW REGULATOR MOTOR) Disconnect the J2 power window regulator motor assembly (for front passenger side) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2A-27 (LIN2) - J2-9 (LIN) 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 (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 J2-2 (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 J2-1 (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 FRONT PASSENGER SIDE) Replace the power window regulator motor assembly (for front passenger side). Refer to «REMOVAL»(ref-568822-S30825573362013072300000) . 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 B2322 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)
  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 - POWER WINDOW REGULATOR MOTOR) Disconnect the L2 power window regulator motor assembly (for rear RH side) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2A-27 (LIN2) - L2-9 (LIN) 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 (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 L2-2 (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 L2-1 (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 (for REAR RH SIDE) Replace the power window regulator motor assembly (for rear RH 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 B2323 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)
  1. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - EACH ECU) Disconnect the H1, H4, H22 and A22 connectors. Measure the resistance and voltage according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H1-29 (LIN) - A22-24 (LIN) Always Below 1 ohms H1-29 (LIN) - H4-11 (LIN2) Always Below 1 ohms H1-29 (LIN) - H22-3 (LIN1) Always Below 1 ohms H1-29 (LIN) - Body ground Always 10 kohms or higher Standard Voltage Tester Connection Condition Specified Condition H1-29 (LIN) - Body ground Always Below 1 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  2. CHECK DTC OUTPUT (TRANSMISSION CONTROL ECU ASSEMBLY) Reconnect the H1, H4 and H22 connectors. Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-568820-S20386481962013072300000) . Recheck for DTCs. Result Result Proceed to DTC B2785 is output A DTC B2785 is not output B B --> See step 5 A: Go to next step
  3. CHECK DTC OUTPUT (POWER MANAGEMENT CONTROL ECU) Reconnect the A22 connector. Disconnect the H4 connector. Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-568820-S20386481962013072300000) . Recheck for DTCs. Result Result Proceed to DTC B2785 is output A DTC B2785 is not output B B --> See step 8 A: Go to next step
  4. CHECK DTC OUTPUT (ID CODE BOX (IMMOBILIZER CODE ECU)) Reconnect the H4 connector. Disconnect the H22 connector. Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-568820-S20386481962013072300000) . Recheck for DTCs. Result Result Proceed to DTC B2785 is output A DTC B2785 is not output B B --> See step 6 A --> See step 7
  5. REPLACE TRANSMISSION CONTROL ECU ASSEMBLY. Refer to «REMOVAL»(ref-568724-S20144004162013072300000)
  6. REPLACE ID CODE BOX (IMMOBILIZER CODE ECU). Refer to «REMOVAL»(ref-568797-S34163913932013072300000)
  7. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to «REMOVAL»(ref-568797-S38879700432013072300000)
  8. REPLACE POWER MANAGEMENT CONTROL ECU. Refer to «REMOVAL»(ref-568756-S19873439732013072300000)
  1. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL ECU ASSEMBLY - BATTERY AND BODY GROUND) Disconnect the A21 and A22 transmission control ECU assembly connectors. Measure the resistance and voltage according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A22-6 (E01) - Body ground Always Below 1 ohms A22-5 (E02) - Body ground Always Below 1 ohms A22-1 (E1) - Body ground Always Below 1 ohms Standard Voltage Tester Connection Condition Specified Condition A21-15 (BATT) - Body ground Power switch off 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - TRANSMISSION CONTROL ECU ASSEMBLY) Disconnect the H1 certification ECU (smart key ECU assembly) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H1-29 (LIN) - A22-24 (LIN) Always Below 1 ohms H1-29 (LIN) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  3. REPLACE TRANSMISSION CONTROL ECU ASSEMBLY Replace the transmission control ECU assembly. Refer to «REMOVAL»(ref-568724-S20144004162013072300000) . NEXT: Go to next step
  4. CHECK DTC OUTPUT Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-568820-S20386481962013072300000) . Recheck for DTCs. OK DTC B2786 is not output. NG --> See step 5 OK --> END (TRANSMISSION CONTROL ECU ASSEMBLY WAS DEFECTIVE)
  5. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to «REMOVAL»(ref-568797-S38879700432013072300000)
  1. CHECK HARNESS AND CONNECTOR (ID CODE BOX - BATTERY AND BODY GROUND) Disconnect the H22 ID code box (immobilizer code ECU) connector. Measure the resistance and voltage according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H22-8 (GND) - Body ground Always Below 1 ohms Standard Voltage Tester Connection Condition Specified Condition H22-1 (+B) - Body ground Power switch off 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ID CODE BOX) Disconnect the H1 certification ECU (smart key ECU assembly) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H1-29 (LIN) - H22-3 (LIN1) Always Below 1 ohms H1-29 (LIN) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  3. REPLACE ID CODE BOX (IMMOBILIZER CODE ECU) Replace the ID code box (immobilizer code ECU). Refer to «REMOVAL»(ref-568797-S34163913932013072300000) . NEXT: Go to next step
  4. CHECK DTC OUTPUT Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-568820-S20386481962013072300000) . Recheck for DTCs. OK DTC B2789 is not output. NG --> See step 5 OK --> END (ID CODE BOX (IMMOBILIZER CODE ECU) WAS DEFECTIVE)
  5. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to «REMOVAL»(ref-568797-S38879700432013072300000)
  1. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY AND BODY GROUND) Disconnect the H3 and H4 power management control ECU connectors. Measure the resistance and voltage according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H3-6 (E1) - Body ground Always Below 1 ohms Standard Voltage Tester Connection Condition Specified Condition H3-1 (AM22) - Body ground Power switch off 11 to 14 V H4-7 (AM21) - Body ground Power switch off 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - POWER MANAGEMENT CONTROL ECU) Disconnect the H1 certification ECU (smart key ECU assembly) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H1-29 (LIN) - H4-11 (LIN2) Always Below 1 ohms H1-29 (LIN) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  3. REPLACE POWER MANAGEMENT CONTROL ECU Replace the power management control ECU. Refer to «REMOVAL»(ref-568756-S19873439732013072300000) . NEXT: Go to next step
  4. CHECK DTC OUTPUT Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-568820-S20386481962013072300000) . Recheck for DTCs. OK DTC B278C is not output. NG --> See step 5 OK --> END (POWER MANAGEMENT CONTROL ECU WAS DEFECTIVE)
  5. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to «REMOVAL»(ref-568797-S38879700432013072300000)

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