Precautions for trouble diagnosis
CAUTION:
Precautions for Harness Repair
Note: a fray of twisted lines must be within 110 mm (4.33 In).

NOTE: Bypass connection may cause CAN communication error. The spliced wire becomes separated and the characteristics of twisted line are lost.

CAN fundamental
System descriptionHeadlight control switch
Type A (if so equipped)
When turning the switch to the
position,
the front parking, tail, license plate and
instrument panel lights come on.
When turning the switch to the
position,
the headlights come on and all the other
lights remain on.
Type B (if so equipped)
...
P0604 ECM
DTC Description
DTC DETECTION LOGIC
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
P0604
ECM
[Internal control module random access
memory (RAM) error]
Malfunction in the internal RAM of ECM.
POSSIBLE CAUSE
ECM
FAIL-SAF ...
Overdrive control switch
Component Function Check
1.CHECK O/D OFF INDICATOR LAMP FUNCTION
Check O/D OFF indicator lamp turns ON for approx. 2 seconds when ignition
switch turns ON.
Is the inspection results normal?
YES >> GO TO 2.
NO >> Go to TM-181, "Diagnosis Procedure".
2.CHECK OVERDRIVE ...