Table 1, Diagnostic Plug (XD) and Voltage Supply, Check
TECH 1 refers to table 1 if the unit is correctly connected
but data cannot be received from the control unit.
In this case, perform the following tests.
Carry out TECH 1 self-test as described in the TECH 1
Operating Instructions.
Important: TECH 1 must be connected to the battery
with the battery connection cable for this test.
Carry out check of DLC adapter used as described in the TECH
1 Operating Instructions.
If data still cannot be received after the self-test, check
the
Diagnostic plug (XD) and voltage supply of the control unit
according to table 1.
After completing the check, proceed with section 5.7.1.
Table 1, Diagnostic Plug (XD) and Voltage Supply, Check
from: diagnostic
plug XD Ter. 16
to: ground
· Ignition OFF
· Disconnect wiring harness plug from:
K85
transmission control unit
· Ignition ON
from: K85
transmission control unit wiring harness plug Ter. 37
to: K85
transmission control unit wiring harness plug Ter. 19 and 35
· Disconnect TECH 1 from diagnostic plug
· Disconnect wiring harness plug from:
M61
sun roof control unit
K37
central locking control unit
K85
transmission control unit
· Connect TECH 1 to diagnostic plug XD
|
Notes on trouble-shooting:
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Nominal value:
|
Cause of fault:
(If nominal value is not
attained)
|
| · Ignition ON |
|
|
|
|
· Measure voltage:
from: battery
+
to: battery
-
|
higher
than 11.5 V
|
· Battery discharged
· Corroded battery terminals
· Poor battery ground connection
|
|
· Measure voltage:
from: battery
+
to: ground
|
higher
than 11.5 V
|
· Battery defective
· Short circuit to ground
from: battery
+
to: fuses
in fuse box
|
| · Measure voltage: |
|
higher than 11 V
|
· Check all fuses
· Circuit interruption or short circuit
to ground
from: battery
+
to: diagnostic
plug XD Ter. 16
|
|
· Measure voltage:
from: diagnostic
plug XD Ter. 4 and 5
to: ground
|
lower than
0.1 V
|
· Short circuit in wiring harness
from: diagnostic
plug XD Ter. 4 or 5
to: battery
+
|
|
· Measure voltage:
from: diagnostic
plug XD Ter. 4 and 5
to: diagnostic
plug XD Ter. 16
|
higher
than 11 V
|
· Circuit interruption
from: diagnostic
plug XD Ter. 4 or 5
to: ground
|
| · Carry out TECH 1 self-test
according to Operating Instructions |
|
TECH 1 OK
|
· See TECH 1 Operating Instructions
|
|
· Measure voltage:
from: K85
transmission control unit wiring harness plug Ter. 37
to: ground
|
higher
than 11 V
|
· Short circuit to ground or circuit
interruption
from: K85
transmission control unit wiring harness plug Ter. 37
to: ignition
lock S1 Ter. 15
|
| · Measure voltage: |
|
higher than 11 V
|
· Circuit interruption
from: K85
transmission control unit wiring harness plug Ter. 19 and 35
to: ground
|
|
· Measure voltage:
from: K85
transmission control unit wiring harness plug Ter. 28
to: ground
|
higher
than 11 V
|
· Circuit interruption
from: K85
transmission control unit wiring harness plug Ter. 28
to: battery
+
· Short circuit in wiring harness
from: K85
transmission control unit wiring harness plug Ter. 28
to: ground
|
| · Ignition OFF |
|
|
|
|
· Ignition ON
· Measure voltage:
from: diagnostic
plug XD Ter. 3
to: ground
|
lower than
0.1 V
|
· Short circuit to voltage
from: diagnostic
plug XD Ter. 3
to: K85
transmission control unit wiring harness plug Ter. 13
|
| · Ignition OFF |
|
|
|
|
· Using multimeter, measure resistance:
from: diagnostic
plug XD Ter. 3
to: K85
transmission control unit wiring harness plug Ter. 13
|
lower than 2 W
|
· Circuit interruption
from: diagnostic
plug XD Ter. 3
to: K85
transmission control unit wiring harness plug Ter. 13
|
|
· Using multimeter, measure resistance:
from: diagnostic
plug XD Ter. 3
to: ground
|
higher than
100 kW (¥)
|
· Short circuit to ground
from: diagnostic
plug XD Ter. 3
to: K85
transmission control unit wiring harness plug Ter. 13
|
| · Connect wiring harness
plug: |
|
Communication is stablished
|
· K85 transmission control unit defective
|
|
· Select transmission control unit
|
If nominal values are attained
|
· M61 sun roof control unit defective
· K37 central locking control unit
defective
|
|
|
|
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