|
No.
|
TECH 1 Display
|
Conditions for
Checking
|
Nominal Value
|
Trouble Codes
|
Terminal
|
|
17
|
BRAKE LIGHT
|
Ignition ON
|
|
-
|
18/2
|
|
|
|
Press brake pedal and release
again
|
OKAY 12V
|
|
26-pin
|
|
|
|
|
|
|
|
|
Notes for Trouble-shooting:
|
Nominal Value:
|
Cause of Fault:
(If nominal value is not attained)
|
|
· Actuate brake pedal
|
Left and right brake lamps ON (if applicable, also on
trailer)
|
· Brake lamp bulb defective
|
|
|
|
|
|
· Ignition OFF
|
|
|
|
· Release and disconnect 26-pin MID
wiring harness plug
|
|
|
|
· Ignition ON:
|
Brake lamp OFF
|
|
|
· Measure voltage between 26-pin MID
wiring harness plug Ter. 18 and ground:
|
lower than 1 V
|
· Lead from bulb control P25/Ter. 8
to H9 has short circuit to + battery voltage
|
|
|
|
· Lead from bulb control P25/Ter. 16
to H10 has short circuit to + battery voltage
|
|
|
|
· Lead from bulb control P25/Ter. 2
to trailer bulb control P39 has short circuit to + battery voltage
|
|
· Actuate brake pedal and measure voltage
between 26-pin MID wiring harness plug Ter. 18 and ground:
|
Brake lamp ON
|
|
|
|
briefly higher than 1 V
|
· Check brake lamps H9 and H10
|
|
|
|
· Lead between brake lamp switch S8 and
P25/Ter. 12 or P39/Ter. 54E is interrupted
|
|
|
|
· Lead between P25/Ter. 8 and H9 or
between P25/Ter. 16 and H10 or between P39/Ter. 54A and trailer brake lamps
is interrupted
|
|
|
|
· Lead between H9 or H10 or trailer brake
lamps and ground is interrupted
|
|
|
|
· Lead between P25/Ter. 2 or P39/Ter. K
and 26-pin MID wiring harness plug Ter. 18 is interrupted
|
|
|
|
· Lead between P25/Ter. 2 or P39/Ter. K
and 26-pin MID wiring harness plug Ter. 18 has short circuit to ground
|
|
|
|
· Bulb control P25/Ter. 5 or P39/Ter. 31
has no ground connection
|
|
|
|
|
|
|
|
If nominal
values are attained:
|
|
|
|
· MID defective
|
|
|
|
· Bulb control P25 or P39 defective
|
|
|
|
|
|
|
|
|
|
|
|
