Toyota Camry (XV70): Communication Malfunction between ECUs Connected by LIN (B2785)
DESCRIPTION
If the certification ECU (smart key ECU assembly) detects a communication error with an ECU connected to the certification bus lines for 7 seconds or more, DTC B2785 will be stored.
|
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
|---|---|---|---|
|
B2785 | Communication Malfunction between ECUs Connected by LIN |
|
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Before replacing the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU), refer to Registration.
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- Before performing the inspection, check that DTC B2789, B278C is not output.
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- When using the Techstream with the ignition switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
PROCEDURE
|
1. | CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ID CODE BOX (IMMOBILISER CODE ECU)) |
(a) Disconnect the K62 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the K152 ID code box (immobiliser code ECU) connector.
(c) Measure the resistance according to the value(s) in the table below.
NOTICE:
Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
| K62-13 (LIN) - K152-2 (LIN1) |
Always | Below 1 Ω |
|
K62-13 (LIN) or K152-2 (LIN1) - Body ground |
Always | 10 kΩ or higher |
| NG | .gif) | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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| 2. |
CHECK FOR DTC |
(a) Reconnect the K62 certification ECU (smart key ECU assembly) connector.
(b) Clear the DTCs.
Body Electrical > Smart Key > Clear DTCs(c) Recheck for DTCs.
Body Electrical > Smart Key > Trouble Codes|
Result | Proceed to |
|---|---|
|
DTC B2785 is output | A |
|
DTC B2785 is not output |
B |
| A |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| B |
| REPLACE ID CODE BOX (IMMOBILISER CODE ECU) |
READ NEXT:
No Response from ID BOX (B2789)
DESCRIPTION This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) stops for 10 seconds or more.
DTC No. Detect
Lost Communication with Power Source Control (B278C)
DESCRIPTION This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and power management control ECU stops for 10 seconds or more.
DTC No. Detection It
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ABS Pump Motor Control Circuit Short to Ground (C052C11,C052C13,C052F14,C142719)
DESCRIPTION The ABS motor relay is built into the brake actuator assembly.
When the skid control ECU (brake actuator assembly) operates ABS, TRAC, VSC or brake assist, the ABS motor relay turns ON and drives the motor pump built into the brake actuator assembly.
DTC No. Detection Item
