Mazda RX-8 Workshop Manual page 4141

Check code 55
STEP
1 After selecting the check code 55, turn the panel light control
switch toward bright until a click is heard. (Dimmer switch on)
2 Turn the panel light control switch toward dark until a click is heard.
(Dimmer switch off)
Check code 55
INSPECTION CONDITION
Input signal to the instrument cluster is
normal.
Dimmer switch ON/OFF signal
DISPLAY
Go to the next step.
Verify that the voltage of the instrument cluster
terminal 2U is 5V.
If the voltage is as specified,
replace the instrument cluster.
If the voltage is not as specified,
inspect the following parts:
Verify that the voltage of the instrument cluster
terminal 2U is 1.0V or less.
If the voltage is as specified,
replace the instrument cluster.
If the voltage is not as specified,
inspect the following parts:
Input signal to the instrument cluster is normal.
Wiring
harness
(Key
reminder
switch—
instrument
cluster)
ACTION
Panel light
control switch
Wiring harness
(Battery—panel
light control
switch—
instrument
cluster)
Panel light
control switch
Wiring harness
(Battery—panel
light control
switch—
instrument
cluster)