1.CHECK FUNCTION

Is the inspection result normal?
YES >> Front door request switch is OK.
NO >> Refer to DLK "Diagnosis Procedure".
Regarding Wiring Diagram information, refer to DLK "INTELLIGENT KEY SYSTEM : Wiring Diagram".
1.CHECK DOOR REQUEST SWITCH INPUT SIGNAL

Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK DOOR REQUEST SWITCH CIRCUIT


Is the inspection result normal?
YES >> Replace BCM. Refer to BCS "Removal and Installation".
NO >> Repair or replace harness.
3.CHECK DOOR REQUEST SWITCH GROUND CIRCUIT
Check continuity between malfunctioning front door request switch harness
connector and ground. 
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace harness.
4.CHECK DOOR REQUEST SWITCH
Refer to DLK "Component Inspection".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace malfunctioning front door request switch.
5.CHECK INTERMITTENT INCIDENT
Refer to GI "Intermittent Incident".
>> Inspection End.
1.CHECK DOOR REQUEST SWITCH

Is the inspection result normal?
YES >> Inspection End.
NO >> Replace malfunctioning front door request switch.
P0890 TCM
DTC Logic
DTC DETECTION LOGIC
DTC
Trouble diagnosis name
DTC detection condition
Possible causes
P0890
Transmission Control Module
Power Relay Sense Circuit Low
Under the following diagnosis
conditions, the battery voltage
supplied to the TCM is less than
...
U0155 Lost communication (IPC)
Description
CAN (Controller Area Network) is a serial communication line for real-time
application. It is an on-vehicle multiplex
communication line with high data communication speed and excellent malfunction
detection ability.
Many electronic control units are equipped onto a vehicle, and ...