DESCRIPTION
Even if the downhill assist control switch is pressed, the downhill assist control indicator light blinks and downhill assist control does not activate under the following conditions:
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
When replacing the master cylinder solenoid, perform calibration (See page ).
PROCEDURE
1. |
CHECK CAN COMMUNICATION LINE |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Select CAN Bus Check from the System Selection Menu screen and follow the prompts on the screen to inspect the CAN bus (See page ).
OK:
CAN Bus Check indicates no malfunctions in CAN communication.
NG |
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
|
2. |
CHECK FOR DTC |
(a) Check for DTCs (See page ).
Result |
Proceed to |
---|---|
DTC is not output |
A |
DTC is output |
B |
B |
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS |
|
3. |
INSPECT DOWNHILL ASSIST CONTROL SWITCH |
(a) Remove the downhill assist control switch (See page ).
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
NG |
REPLACE DOWNHILL ASSIST CONTROL SWITCH |
|
4. |
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU HDCS CIRCUIT) |
(a) Disconnect the A6 skid control ECU connector.
(b) Disconnect the U4 downhill assist control switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
A6-44 (HDCS) - U4-4 (+B2) |
Always |
Below 1 Ω |
A6-44 (HDCS) - Body ground |
Always |
10 kΩ or higher |
U4-1 (E) - Body ground |
Always |
Below 1 Ω |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. |
READ VALUE USING TECHSTREAM (DOWNHILL ASSIST CONTROL LIGHT) |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
ABS/VSC/TRAC
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
Downhill Assist Control Light |
Downhill assist control indicator light/ ON or OFF |
ON: Indicator light on OFF: Indicator light off |
- |
(f) When performing the Downhill Assist Control Light Active Test, check Downhill
Assist Control Light in the Data List (See page
).
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
---|---|---|---|
Downhill Assist Control Light |
Downhill assist control indicator light |
Indicator light ON/OFF |
Observe the combination meter. |
Result |
Proceed to |
|
---|---|---|
Data List Display |
Data List Display when Performing Active Test ON/OFF Operation |
|
ON |
Does not change between ON and OFF |
A |
Changes between ON and OFF |
B |
|
OFF |
Does not change between ON and OFF |
A |
Changes between ON and OFF |
B |
A |
REPLACE MASTER CYLINDER SOLENOID |
B |
GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
Sliding Roof ECU Communication Stop (B1273)
DESCRIPTION
This DTC is stored when LIN communication between the sliding roof ECU (sliding
roof drive gear sub-assembly) and main body ECU (multiplex network body ECU) stops
for 10 seconds or more.
DTC Code
DTC Detection Condition
...
Shifting between H2 and H4
Shifting from H2 to H4
Type A
Reduce vehicle speed to less
than 50 mph (80 km/h).
Shift the front-wheel drive
control lever to H4.
Type B
Reduce vehicle speed to less
than 62 mph (100 km/h).
Push the “UNLOCK” button and
turn the front-whee ...