cilt90.pdf

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05–1738
DIAGNOSTICS
–
LIGHTING SYSTEM
05HJT–01
HEIGHT CONTROL SENSOR CIRCUIT
CIRCUIT DESCRIPTION
The headlamp leveling ECU assy receives the height control sensor signal from the height control sensor
sub–assy or height control ECU.
The headlamp leveling ECU assy calculates a height value from the height control signal. The voltage at
the power source of the height control sensor is corrected when SHR is detected.
WIRING DIAGRAM
H18
Height Control Sensor
H12
Headlamp Leveling ECU Assy
20
SHG
Y
Y
IC1
SGR
20
1
19
SHRL
L
L
IC1
SHR
2
5
18
SHB
P
P
IC1
SBR
3
2
I39994
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1902
751527092.020.png
05–1739
DIAGNOSTICS
–
LIGHTING SYSTEM
INSPECTION PROCEDURE
1
INSPECT HEIGHT CONTROL SENSOR SUB–ASSY REAR LH
(a)
Connect 3 dry cell batteries (1.5 V) in series.
(b)
Connect the positive (+) lead from the battery to terminal
3 and negative (–) lead from the battery to terminal 1.
–45
(c)
Measure the voltage between terminals 1 and 2 when
slowly moving the link up and down.
Standard:
Link angle
2.1
6
0
Standard voltage
+45
(High)
Approx. 4.5 V
0 (Normal)
Approx. 2.5 V
–45 (Low)
Approx. 0.5 V
+45
H18
SHG
SHB
3
2
1
SHRL
NG
REPLACE HEIGHT CONTROL SENSOR
SUB–ASSY REAR LH (SEE PAGE 65–25 )
I39980
E72842
OK
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1903
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05–1740
DIAGNOSTICS
–
LIGHTING SYSTEM
2
CHECK HARNESS AND CONNECTOR(HEIGHT CONTROL SENSOR SUB–ASSY
REAR LH – HEADLAMP LEVELING ECU ASSY)
(a)
Disconnect the H12 connector from headlamp leveling
ECU assy.
Wire Harness View:
Height Control Sensor Rear LH
H18
(b)
Measure the resistance according to the value(s) in the
table below.
SHG
SHB
SHRL
Headlamp Leveling ECU Assy
H12
5
2
20
E69138
I39979
I39981
Standard:
Tester connection
Condition
Specified condition
H12–20 (SGR) – H18–1 (SHG)
Always
Below 1
W
H12–5 (SHR) – H18–2 (SHRL)
Always
Below 1 W
H12–2 (SBR) – H18–3 (SHB)
Always
Below 1
W
H18–1 (SHG) – Body ground
Always
10 k W or higher
H18–2 (SHRL) – Body ground
Always
10 k
W
or higher
H18–3 (SHB) – Body ground
Always
10 k W or higher
NG
REPAIR
OR
REPLACE
HARNESS
OR
CONNECTOR
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(SEE PAGE 05–1677 )
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1904
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