Troubleshooting by failure code
Failure code [DDDLKY] (Ladder lower operation switch hot short circuit)
WA900-3E0
No. Cause Procedure, measuring location, criteria and remarks
6 Defective diode
1. Turn starting switch to OFF position.
2. Disconnect PD03.
a Measure with multimeter in diode range.
Continuity
Between PD03 (male) (1) (+) and PD03 (male) (2)
(-)
Continuity
Between PD03 (male) (3) (+) and PD03 (male) (2)
(-)
Continuity
Between PD03 (male) (2) (+) and PD03 (male) (1)
(-)
No continu-
ity
Between PD01 (male) (2) (+) and PD01 (male) (3)
(-)
No continu-
ity
7
Defective power ladder controller
a If monitoring results satisfy
conditions shown on the right,
this failure code does not ap-
pear and system is normal.
1. Turn starting switch to ON position and perform troubleshooting with moni-
toring function.
Displayed
value
Code: 40989 "D-IN-1"
"0" is displayed when
LOWER switch is OFF.
Code: 40989 "D-IN-1"
"1" is displayed when
LOWER switch is ON.
Code: 40989 "D-IN-4"
"0" is displayed while
parking brake is applied.
Code: 40989 "D-IN-4"
"1" is displayed while
parking brake is
released.
40-39
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