Inspection Procedure

WARNING: This page is about a different car, the 2009 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

When DTC B2785 and B2287 are output simultaneously, perform the troubleshooting for DTC B2785 first.

NOTE: If the certification ECU (smart key ECU assembly) is replaced, register the keys and ECU communication ID (See REGISTRATION ).

CLEAR DTC
1. Clear the DTC (See DIAGNOSIS SYSTEM ).
CHECK FOR DTC
1. Recheck for the DTC (See DIAGNOSIS SYSTEM ).
OK: B2287 is not output.

NG: Go to step 3

OK: USE SIMULATION METHOD TO CHECK (See HOW TO PROCEED WITH TROUBLESHOOTING )

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - MAIN BODY ECU)

Disconnect the E36 and 2C connectors.
Measure the resistance and voltage according to the value (s) in the table below.

Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
E36-10 (LIN) - 2C-12 (LIN1)	Always	Below 1 Ω
E36-10 (LIN) - Body ground	Always	10 kΩ or higher

Standard Voltage

STANDARD VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
E36-10 (LIN) - Body ground	Always	Below 1 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 1: Identifying E36 And 2C Connectors

OK: Go to Next Step

REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
1. Replace the main body ECU (instrument panel junction block).
CHECK FOR DTC
1. Clear the DTC (See DIAGNOSIS SYSTEM ).
2. Recheck for the DTC.
OK: B2287 is not output.

NG: REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (See CERTIFICATION ECU )

OK: END (MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) IS DEFECTIVE)