DESCRIPTION
When the engine switch is pushed with the electrical key in the cabin, the power management control ECU receives signals to change the power source mode.
HINT:
To allow use of the Techstream to inspect the push-button start function when the power source mode is off, repeat opening and closing any of the doors. Opening and closing a door establishes communication between the Techstream and the power management control ECU. (Opening and closing a door can also be simulated by operating a door courtesy light switch.)
WIRING DIAGRAM
Refer to DTC B2274 (See page ).
PROCEDURE
1. |
CHECK HARNESS AND CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU) |
See page
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU) |
|
2. |
CHECK HARNESS AND CONNECTOR |
See page
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
INSPECT ACC RELAY |
See page
NG | ![]() |
REPLACE ACC RELAY |
|
4. |
CHECK HARNESS AND CONNECTOR |
See page
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. |
CHECK HARNESS AND CONNECTOR |
See page
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
6. |
CHECK POWER MANAGEMENT CONTROL ECU |
(a) Reconnect the all connectors. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
D43-19 (ACCD) - Body ground |
Engine switch off |
Below 1 V |
D43-19 (ACCD) - Body ground |
Engine switch on (IG) |
Output voltage at terminal AM21 or AM22 -2 V or more |
*1 |
Components with harness connected (Power Management Control ECU) |
OK | ![]() |
REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) |
NG | ![]() |
REPLACE POWER MANAGEMENT CONTROL ECU |
Dtc Check / Clear
DTC CHECK / CLEAR
NOTICE:
When the diagnosis system is changed from normal mode to check mode or vice versa,
all DTCs and freeze frame data recorded in normal mode are cleared. Before changing
modes, always check and make a note of DTCs and freeze frame ...
ECM Power Source Circuit
DESCRIPTION
When the ignition switch is turned to ON, the battery voltage is applied to IGSW
of the ECM. The output signal from the MREL terminal of the ECM causes a current
to flow to the coil, closing the contact of the engine room junction block assemb ...
Seat Belt Buckle Switch LH Circuit Malfunction (B1656/38)
DESCRIPTION
The seat belt buckle switch LH circuit consists of the center airbag sensor assembly
and front seat inner belt assembly LH.
DTC B1656/38 is stored when a malfunction is detected in the seat belt buckle
switch LH circuit.
DTC No.
...