Mazda RX-8 Manual page 1547

NO.3 BRAKE SYSTEM WARNING LIGHT DOES NOT ILLUMINATE WHEN IGNITION
SWITCH TURNED TO ON POSITION
BRAKE system warning light does not illuminate when the ignition switch is turned to the ON
3 position.
[TROUBLESHOOTING HINTS]
Malfunction of instrument cluster or ABS HU/CM
•
Diagnostic procedure
STEP INSPECTION
CONFIRM DTC U1900 USING WDS OR
EQUIVALENT
1
Retrieve DTCs from the PCM, ABS and
•
instrument cluster.
Is DTC U1900 retrieved?
•
CONFIRM THE FOLLOWING PIDs USING
WDS OR EQUIVALENT:
ABS_MSG
•
PCM_MSG
•
2
EPS_MSG
•
TPM_MSG
•
Is "not present" message displayed on WDS
•
or equivalent?
ACTION
Yes Go to the next step.
Inspect the instrument cluster. If normal, go
No
to the next step.
Replace the instrument cluster (open circuit
Yes
in instrument cluster).
Inspect network communication for related
system malfunction.
No
Repair or replace if necessary.
(w) RX8 - Brakes
Page 133