Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CAN COMMUNICATION SYSTEM

Check if the CAN communication system DTC is output (see DIAGNOSIS SYSTEM ).

Result

RESULT PROCEED

Result	Proceed to
DTC is not output	A
DTC is output	B

B: REPAIR CAN COMMUNICATION SYSTEM

A: GO TO NEXT STEP.

READ VALUE OF INTELLIGENT TESTER (DOWNHILL ASSIST CONTROL SWITCH)

Check the DATA LIST for proper functioning of the downhill assist control switch.

Skid control ECU

ITEM REFERENCE

Item (Display)	Measurement Item / Range (Display)	Normal Condition	Diagnostic Note
Downhill assist control SW	Downhill assist control switch / ON or OFF	ON: Downhill assist control switch is ON OFF: Downhill assist control switch is OFF	-

OK: ON (downhill assist control switch is ON) appears on the screen.

NG: Go to step 5

OK: GO TO NEXT STEP.

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (DAC INDICATOR LIGHT)

Select the ACTIVE TEST, generate a control command, and then check that the downhill assist control indicator light operates.

Skid control ECU

ITEM REFERENCE

Item (Display)	Test Details	Diagnostic Note
Downhill assist control INDI LAMP	Turn downhill assist control indicator light ON / OFF	Observe combination meter

OK: The downhill assist control indicator light turns ON and OFF.

OK: REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY

NG: GO TO NEXT STEP.

INSPECT COMBINATION METER
1. Inspect the combination meter (see PROBLEM SYMPTOMS TABLE ).
NG: REPLACE COMBINATION METER ASSEMBLY

OK: REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY

INSPECT DOWNHILL ASSIST CONTROL SWITCH

Remove the downhill assist control switch.

Measure the resistance of the switch.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Switch Condition	Specified Condition
4 - 1	Switch is pushed	Below 1 Ω
4 - 1	Switch is not pushed	10 kΩ or higher

Fig 1: Inspecting Downhill Assist Control Switch

NG: REPLACE DOWNHILL ASSIST CONTROL SWITCH

OK: GO TO NEXT STEP.

CHECK WIRE HARNESS (CONTROL SWITCH - SKID CONTROL ECU AND BODY GROUND)

Disconnect the A19 ECU connector.
Disconnect the E31 switch connector.

Fig 2: Identifying A19 ECU Harness Connector Terminals HDCS & E31 Switch Connector

Measure the resistance of the wire harness side connectors.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
A19-28 (HDCS) - E31-4	Below 1 Ω
E31-1 - Body ground	Below 1 Ω
A19-28 (HDCS) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY