Fault diagnosis, handbrake warning lamp(MIU 2)
Fault diagnosis, handbrake warning lamp (MIU 2) |
Fault symptoms
The lamp does not light up when the handbrake is applied.The central warning lamp does not light up when the speed of the car exceeds 5 km/h with the handbrake applied.
Diagnostic procedure
1. |
If only the central warning lamp lights up the
indicator lamp bulb is faulty and must be changed.
If neither of the lamps light up, continue with point 2. |
2. |
Connect an ISAT Scan Tool and select "READ VALUES" followed by
"WARNING INPUTS" and "HANDBRAKE".
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3. |
If in proper working order, the Scan Tool's display should read
"HANDBRAKE ON" when the handbrake is applied and "HANDBRAKE OFF" when it is not
applied.
If this is the case, the bulb is probably faulty and must be changed. If the lamp still fails to light up when activated, check that the new bulb is OK by fitting it in place of another bulb in the main instrument display panel that does light up. If the bulb is intact, continue with point 7. If "HANDBRAKE OFF" is displayed in both cases, there is a fault in the connection from the handbrake warning lamp switch. Continue with point 4. |
4. |
Check the handbrake warning light switch visually to make sure that it is correctly
fitted and that the contacts close when the switch is extended.
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6. |
Check for an open circuit by taking a reading across pin 1 on the BOB and a
good grounding point.
The resistance reading obtained should be < 1 ohm. If the wiring is not OK, investigate the cause and take appropriate action. If the wiring is OK, the fault is probably in the main instrument display panel's processor card. Ground pin 1 on the BOB. If the warning lamp does not light up, continue on page |