In the BCM receives wipe
auto switch "ON" signal with IGN2 "ON", it controls wiper low or high
relay according to input signal from rain sensor.
When wiper switch is set
to "AUTO", M/F (mulity function) switch transmits a signal about wiper
switch posion (for instance INT2,INT1,INT0) to BCM thought LIN
communication line.
[BCM output signal (BCM
to rain sensor)]
BCM sends a sensitivity
signal of the wiper auto switch to the rain sensor. The requested
sensitivity signal consists of a modulated pulse waveform.
[BCM input signal (Rain
sensor to BCM)]
The rain sensor sends
back a signal (rain detected, low speed request, high speed request) to
the BCM. The signal of the rains sensor consists of a modulated pulse
waveform.
* The rain sensor shall
output the various modes accoding to the following chart:
[Rain sensor output signal(Rain sensor
to BCM)]
NO
|
MODE
|
Duty Cycle
|
1
|
OFF
|
9.5% ±
3%
|
2
|
Fault 1
Detected
|
23.8% ±
3%
|
3
|
Fault 2
Detected
|
38.0% ±
3%
|
4
|
Fault 3
Detected
|
52.4% ±
3%
|
5
|
Rain
Detected
|
66.7% ±
3%
|
6
|
Low Speed
Request
|
81.0% ±
3%
|
7
|
High Speed
Request
|
95.2% ±
3%
|
Overall Period must be 15
mSec
|
This code is set if the
rain sensor doesn't receive message from BCM or BCM detects abnormal
signal from rain sensor during IG KEY "ON" & wiper switch
"AUTO".
Possible cause is as
below;
| 1. |
When the rain sensor is shoot after detached
from front glass. |
| 2. |
Input or output signal line of the rain sensor
open circuited. |
| 3. |
Disconnectted rain sensor
connector. |
| 4. |
Input or output signal line of the rain sensor
short to ground. |
Item
|
Detecting
Condition
|
Possible cause
|
DTC
Strategy
|
| •
|
Check the signal between BCM and rain
sensor | |
| •
|
The rain sensor doesn't receive message
from BCM for more than
0.5s. | |
Enable
Conditions
|
| •
|
When no signal from
BCM | |
Threshold
Value
|
| •
|
Output signal with duty cycle 52.4% ±
3% | |
Diagnostic
Time
|
|
| 1. |
Ignition "OFF", connect
scantool. |
| 2. |
Ignition "ON" & Engine "OFF", select
"Diagnostic Trouble Codes(DTC)"
mode. |
| 3. |
Monitor diagnostic trouble code and present of
trouble code. |
| 4. |
Using a scan tool, clear the DTC.
|
| 5. |
Are any DTC present?
|
|
▶ Go to
"W/Harness Inspection" procedure.
|
|
|
▶
Displaying nothing(no DTC) shows that Fault is intermittent
caused by poor contact in the part's and/or RAIN SENSOR
connector or was repaired and BCM memory was not
cleared.
Thoroughly check
connectors for looseness, poor connection, bending, corrosion,
contamination, deterioration, or damage.
▶ Repair or replace as necessary and then go to
"Verification of Vehicle Repair"
procedure.
|
|
| Terminal And Connector
Inspection |
| 1. |
Many malfunctions in the electrical system are
caused by poor harness(es) and terminals. Faults can also be caused
by interference from other electrical systems and mechanical or
chemical damage. |
| 2. |
Check the following conditions:
| (1) |
Check for damaged harness and terminals:
contact resistance, oxidation, bent or broken
terminals. |
| (2) |
Check for poor connection between ECM
and component: backed out terminal, improper mating, broken
locks and poor terminal to wire
connection. |
|
Using a suitable male pin to ensure that
contact in sockets is good. The pin should remain in position
when pulled
gently. | |
| 3. |
Has a problem been found?
|
|
▶ Repair as
necessary and then go to "Verification of Vehicle Repair"
procedure.
|
|
|
▶ Go to
"Signal Circuit Inspection"
procedure.
|
|
| Signal Circuit
Inspection |
| 1. |
Check BCM's sending signal
| (1) |
Engine "ON" and wiper switch
"AUTO" |
| (2) |
Connect scantool and select VEHICLE
SCOPEMETER function. |
| (3) |
Measure waveform between rain sensor
harness connector.
Specification : If
BCM sends a pulse width modulated waveform, it is
OK.
| |
| (4) |
Is measured resistance within
specifications?
|
|
▶
Thoroughly check connectors for looseness, poor
connection, bending, corrosion, contamination,
deterioration or damage.
Repair or replace as necessary and then go to
"Verification of Vehicle Repair"
procedure.
|
|
|
▶ Go
to "Check signal circuit" as
below.
|
| |
| 2. |
Check signal circuit
| (1) |
Ignition "ON" and Engine
"OFF" |
| (2) |
Disconnect rain sensor and BCM
connector. |
| (3) |
Measure resistance between of the RAIN
SENSOR harness connector and BCM harness
connector.
Specification :
Approx. 1 Ω below.
| |
| (4) |
Is the measured resistance within
specifications?
|
|
▶
Thoroughly check connectors for looseness, poor
connection, bending, corrosion, contamination,
deterioration or damage.
Repair or replace as necessary and then go to
"Verification of Vehicle Repair"
procedure.
|
|
|
▶
Substitute with a known-good BCM and check proper
condition.
If the problem is
corrected, replace BCM and then go to "Verification of
Vehicle Repair"
procedure.
|
| |
| Verification Of Vehicle
Repair |
After a repair, it is
essential to verifying that the fault has been corrected.
| 1. |
Connect scan tool and select "Diagnostic
Trouble Codes(DTCs)" mode. |
| 2. |
Using scantool, Clear
DTC. |
| 3. |
Operate the vehicle within DTC Enable
conditions in General information. |
| 4. |
Are any DTCs present ?
|
|
▶ Go to the
applicable troubleshooting procedure.
|
|
|
▶ System is
performing to specification at this
time.
|
|
