Chrysler 300M 1999 Manual page 413

TEST 3A
CONTINUED - REPAIRING "A/C CONTROL EBL SWITCH FAILURE" TROUBLE CODE
TEST 3A
CONTINUED FROM
THE PREVIOUS
PAGE.
WITH THE DRB READ
THE "MODE SWITCH
MUX" VOLTAGE.
PRESS AND HOLD THE
REAR DEFOGGER
SWITCH ON THE
A/C-HEATER CONTROL
HEAD.
*Perform Verification TEST VER-2A.
PRESS AND RELEASE
THE REAR DEFOGGER
BUTTON SEVERAL
TIMES.
OBSERVE THE "MODE
SWITCH MUX"
VOLTAGE.
**Check connectors - Clean / repair as necessary.
403
DOES THE BUTTON YES
SEEM TO STICK AT
TIMES?
NO
WITH THE BUTTON
RELEASED IS THE NO
VOLTAGE
APPROXIMATELY 4.2
VOLTS?
YES
IS THE VOLTAGE YES
APPROXIMATELY 0.25
VOLTS?
NO
REPLACE THE
A/C-HEATER CONTROL
HEAD.*
REPLACE THE
A/C-HEATER CONTROL
HEAD.*
THE SWITCH IS
OPERATING PROPERLY
AT THIS TIME.
RETRY THE SYSTEM
AND RECHECK DTC's.
REPLACE THE
A/C-HEATER CONTROL
HEAD.*
M
A
N
U
A
L
T
E
M
P
E
R
A
T
U
R
E
C
O
N
T
R
O
L
S
Y
S
T
E
M