Home ReviewsRefund Car not listed?
Home/Toyota/Camry/Toyota Camry XV30 (2001-2006)/Repair manual/Communication Devices/Multiplex Communication System - Diagnostics
Contents Wiring diagrams Section: Communication Devices All sections

Multiplex Communication System - Diagnostics Toyota Camry XV30

Communication Devices 13 illustrations ~1039 words

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

Troubleshoot in accordance with the procedure on the following pages.

  1. VEHICLE BROUGHT TO WORKSHOP GO TO NEXT STEP
  2. SYMPTOM CHECK GO TO NEXT STEP
  3. INSPECT COMMUNICATION FUNCTION OF LARGE-SCALE MULTIPLEX COMMUNICATION SYSTEM (BEAN) Check that there is no abnormality in the communication system by inspecting the communication function of the multiplex communication system. (ECU communication stop, communication line abnormal) With code outputs, proceed to A. (ECU communication stop, communication line abnormal) Without code outputs, proceed to B. B GO TO SECTION OF EACH SYSTEM A: GO TO NEXT STEP
  4. DIAGNOSTIC TROUBLE CODE CHECK (See PRE-CHECK ) Check a DTC and note it if a code is output. Delete the DTC. Check if the DTC will be output once again, when the problem symptom is simulated based on the noted code. When no code is output (symptom check and simulation is possible), proceed to A. When no code is output (symptom check and simulation is impossible), proceed to B. When a code is output, proceed to "C". B GO TO PROBLEM SIMULATION (See PROBLEM SYMPTOMS TABLE ) C Go to step 7 . A: GO to step
  5. PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE ) Without applicable symptoms, proceed to A. With applicable symptoms, proceed to B. B Go to step 7 . A: GO TO NEXT STEP
  6. PERFORM TROUBLESHOOTING IN FOLLOWING METHOD, DEPENDING ON MALFUNCTION SYMPTOM Pre-check (See PRE-CHECK ). Terminals of ECU (See TERMINALS OF ECU ).
  7. ADJUSTMENT, REPAIR OR REPLACEMENT GO TO NEXT STEP END

Scheme 3

Scheme 3: PRE-CHECK
Scheme 3: PRE-CHECK

Scheme 4

Scheme 4
Scheme 4
  1. MULTIPLEX COMMUNICATION SYSTEM (BEAN) BEAN communication line is used to control the theft warning ECU (theft deterrent ECU). Since the line connects the body and theft warning ECU (theft deterrent ECU) with one line, the communication goes one way from the theft warning ECU (theft deterrent ECU) to the body ECU.
  2. INSPECT OUTPUT OF DIAGNOSTIC BY DOOR OPEN INDICATOR Inspect the battery positive voltage. Standard: 10 - 14 V (when engine stopped) Check that the diagnostic outputs. NOTE: No abnormality exists in all the following items. Check that the door open indicator will be on when any of the doors is opened. HINT: In case that the indicator will not be on, the following problems are possible reasons; door open indicator LED defective, wire harness short, courtesy light switch's contact condition defective, multiplex network body ECU defective, etc. By using SST (diagnosis check wire No. 2), make a short-circuit between terminals TC (13) and CG (4) of the DLC3. SST 09843-18040 NOTE: Do not make a short-circuit in any other positions. Turn the ignition switch ON and read the number of blinks of the door open indicator. HINT: When 2 or more codes are output simultaneously, display will be started from the smaller numbered code. When the DTC of the ECU unconnected is displayed, perform an inspection depending on the troubleshooting. HINT: When the communication bus is defective the door open indicator in the meter will not be on and therefore any DTC will not be output. When other DTC is output, refer to the DTC table and applicable section. When no DTC is output even in the normal condition, problems, such as short-circuit between terminals TC and CG, meter fuses defective etc., may exist. When the door open indicator is always on, the wire harness might be short-circuited.

DIAGNOSTIC TROUBLE CODE CHART

DTCDescription
DTC 69THEFT DETERRENT ECU COMMUNICATION STOP

DIAGNOSTIC TROUBLE CODES (DTC) LIST

If a malfunction code is displayed during the DTC check, check the circuit listed for that code in the table below. (Proceed to the page given for that circuit.)

DTC No. (Door open indicator)Diagnostic itemDiagnostic result
(See DTC 69 THEFT DETERRENT ECU COMMUNICATION STOP )Theft deterrent ECU communication stopNo communication from theft deterrent ECU more than 10 seconds.

DIAGNOSTIC TROUBLE CODE CHART

Scheme 5

Scheme 5: LOCATION
Scheme 5: LOCATION

Scheme 6

Scheme 6: TERMINALS OF ECU
Scheme 6: TERMINALS OF ECU

Scheme 7

Scheme 7
Scheme 7

Scheme 8

Scheme 8
Scheme 8

Scheme 9

Scheme 9
Scheme 9
  1. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSY (BODY ECU) (REAR SIDE) Disconnect the 2B, 2F and 2G instrument panel J/B connectors, and check the continuity and voltage of each terminal of the disconnected connectors. Standard: * 1 , * 2 : The check should be performed by using the 2D connector* 2 , because the 2R connector* 1 is unavailable for this check. If the result is not as specified, there may be a malfunction on the wire harness side.
  2. CHECK THEFT WARNING ECU (THEFT DETERRENT ECU) Disconnect the T5 theft warning ECU (theft deterrent ECU) connector and check the voltage and continuity of each terminal of the wire harness side connector. Standard: If the result is not as specified, there may be a malfunction on the wire harness side.

PROBLEM SYMPTOMS TABLE

Note. Confirm the problem symptom and make an inspection depending on the applicable flowchart.

Scheme 10

Scheme 10: PROBLEM SYMPTOMS TABLE
Scheme 10: PROBLEM SYMPTOMS TABLE

CIRCUIT DESCRIPTION

DTC 69 will be output when the communication between the instrument panel J/B (body ECU) and theft warning ECU (theft deterrent ECU) stops for more than 10 seconds.

Scheme 11

Scheme 11: CIRCUIT DESCRIPTION
Scheme 11: CIRCUIT DESCRIPTION

Scheme 12

Scheme 12: WIRING DIAGRAM
Scheme 12: WIRING DIAGRAM

Scheme 13

Scheme 13: INSPECTION PROCEDURE
Scheme 13: INSPECTION PROCEDURE

Scheme 14

Scheme 14
Scheme 14

Scheme 15

Scheme 15
Scheme 15
  1. CHECK CONTINUITY OF COMMUNICATION LINE Check the wire harness between the instrument panel J/B (body ECU) and theft warning ECU (theft deterrent ECU). Disconnect the connectors of the B7 instrument panel J/B (body ECU) and T5 theft warning ECU (theft deterrent ECU). Check the continuity between terminal MPX3 (B7-13) of the instrument panel J/B (body ECU) wire harness side connector and terminal MPX1 (T5-10) of the theft warning ECU (theft deterrent ECU) wire harness side connector. Standard: Continuity NG: REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR OK: GO TO NEXT STEP
  2. CHECK THEFT WARNING ECU ASSY (THEFT DETERRENT ECU) (POWER SOURCE) Inspect the ECU power source input. Disconnect the T5 ECU connector. Check the voltage between terminal + B1 (T5-2) of the ECU wire harness side connector and the body ground. Standard: DIAGNOSTIC TROUBLE CODE CHART Symbols (Terminal No.) Wiring color Condition Specified condition +B1 (T5-2) <=> Body ground W-R <=> - Constant 10 - 14 V NG: REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR OK: GO TO NEXT STEP
  3. CHECK THEFT WARNING ECU ASSY (THEFT DETERRENT ECU) (GROUND) Inspect the ECU body ground. Disconnect the T5 ECU connector. Check the continuity between terminal E (T5-11) of the ECU wire harness side connector and the body ground. Standard: Continuity NG: REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR OK: GO TO NEXT STEP REPLACE THEFT WARNING ECU ASSY (THEFT DETERRENT ECU)