HOW TO PROCEED WITH TROUBLESHOOTING
Perform troubleshooting in accordance with the procedure on the following page.
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- DIAGNOSIS SYSTEM As shown in the following diagram, all ECU on this vehicle are connected each other via communication buses through which various signals are transmitted. These communication buses are diagnosed by the Body ECU (Main). When the Body ECU (Main) detects a communication error between ECU, or B+ short or GND short of a communication bus, a DTC is output and stored. The Body ECU (Main) cannot diagnose accurately unless it can function normally. Therefore, first confirm the normal condition by performing a "BASIC INSPECTION" described later, and then, troubleshoot against each DTC. If DTC of ECU communication stop is output, connectors may be disconnected, or communication buses may be open at 2 points. It will not become abnormal with only 1 communication bus open. If 2 communication buses are open at the position as shown in the illustration, DTC of ECU communication stop between those 2 buses is output.
- BASIC INSPECTION Inspect Body ECU (Main). Check that the DTC can be read from Body ECU (Main) using hand-held tester. OK: Go to step 3 "DTC check". NG: Go to Next Step Check the Body ECU (Main) power source circuit. PREPARATION: Disconnect the Body ECU (Main) connector. CHECK: Check voltage terminal BECU and GND. OK: Voltage: 10-14 V CHECK: Check continuity terminal GND1, GND2 and body ground. OK: Continuity PREPARATION: Turn the ignition switch ON. CHECK: Check voltage terminal SIG, BDR1, ACC and GND1. OK: Voltage: 10-14 V NG: Replace or repair wire harness or connector. OK: Go to Next Step Check wire harness between Body ECU (Main) and DLC3. HINT: If there is a failure on SIL line, also hand-held tester cannot communicate with ECM or Center airbag sensor assembly. NG: Replace or repair wire harness or connector. OK: Replace the Body ECU (Main).
- DTC CHECK (Using hand-held tester) Prepare a hand-held tester. Connect the hand-held tester to DLC3. Turn the ignition switch ON and switch the hand-held tester main switch ON. Using the hand-held tester, check DTC and note them down. (For opening instructions, see the hand-held tester's instruction book.) Check the DLC3. The vehicle's ECM uses ISO 9141-2 for communication. The terminal arrangement of DLC3 complies with SAE J1962 and matches the ISO 9141-2 format. HINT: If the display shows "UNABLE TO CONNECT TO VEHICLE" when the cable of the hand- held tester is connected to DLC3, the ignition switch is turned ON and the hand- held tester is operated, there is a problem either on the vehicle side or tool side. If communication is normal when the tool is connected to another vehicle, inspect DLC3 on the original vehicle. If communication does not function when the tool is connected to another vehicle, the problem is probably in the tool itself, so consult the Service Department listed in the tool's instruction manual.
- DTC CLEARANCE PRESENT CODE: DTC will be cleared when the trouble output as DTC is recovered normally. PAST CODE: Clear it using the hand-held tester.
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during DTC check, check the circuit corresponding to the code in the table below.
| DTC | Description |
|---|---|
| DTC B1211 | Driver door ECU communication stop |
| DTC B1213 | Tilt and Telescopic ECU communication stop |
| DTC B1214, B1215 | Door system communication bus malfunction (+B short)/(GND short) |
| DTC B1218 | Body ECU No. 2 communication stop |
| DTC B1245 | Auto wiper ECU communication stop |
| DTC B1269 | Theft deterrent ECU communication stop |
| DTC B1272 | Power seat ECU communication stop |
| DTC B1273 | Sliding roof control ECU communication stop (w/ Sliding roof vehicle only) |
| DTC B1275 | Accessory Bus Buffer communication stop |
| DTC B1276 | Mirror ECU communication stop |
| DTC B1279 | Rain sensor communication stop |
| DTC B1281 | Airbag ECU communication stop |
DIAGNOSTIC TROUBLE CODE CHART
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HINT
- *: Optional setting
- When DTC of "+B or GND short malfunction of communication bus (such as B1214, B1215 etc.)" and "communication stop (such as B1211, B1212 etc.)" is detected simultaneously, please repair DTC of "+B or GND short malfunction of communication bus first".
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CIRCUIT DESCRIPTION
This DTC is output when communication stops between the Power window master switch (Driver door ECU) and the Body ECU (Main).
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This DTC is output when communication stops between the Tilt and telescopic ECU and the Body ECU (Main).
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This DTC is output when +B or GND short occurs on the door system communication bus.
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- Check communication circuit inside ECU. PREPARATION: Disconnect the following ECU connectors in order from the top to down. HINT. Before disconnecting the next connector, be sure that disconnected ECU connector is reconnected. CHECK: Check the DTC whenever each connector is disconnected. OK: DTC B1214 or B1215 is not output. OK: Replace corresponding ECU (ECU for which DTC is deleted is defective.)(See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Go to Next Step
- Check for short circuit. (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ) PREPARATION: Disconnect the following connectors of ECU. HINT: Before disconnecting the next connector, be sure to reconnect the ECU connector that is disconnected. CHECK: Check whether or not there is +B short and GND short between the above connectors. OK: No +B short and GND short. NG: Repair or replace corresponding wire harness. OK: Replace body ECU (Main) (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ).
This DTC is output when communication stops between the Body ECU (Sub) and the Body ECU (Main).
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CIRCUIT INSPECTION
This DTC is output when communication stops between the Wiper control ECU and the Body ECU (Main).
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This DTC is output when communication stops between the Theft deterrent ECU and the Body ECU (Main).
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This DTC is output when communication stops between the Power seat ECU (driver seat ECU) and the Body ECU (Main).
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This DTC is output when communication stops between the Sliding roof ECU and the Body ECU (Main).
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This DTC is output when communication stops between the Bus buffer ECU and the Body ECU (Main).
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This DTC is output when communication stops between the Mirror control ECU and the Body ECU (Main).
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This DTC is output when communication stops between the Rain sensor and the Body ECU (Main).
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This DTC is output when communication stops between the Airbag sensor assembly and the Body ECU (Main).
