Repairing A/C Control A/C Switch Failure Trouble; Code - Chrysler 300M 1999 Manual

TEST 2A
REPAIRING A/C CONTROL A/C SWITCH FAILURE TROUBLE CODE
Perform TEST 1B Before Proceeding
START TEST 2A.
KEY ON.
USING THE DRB,
ERASE THE TROUBLE

CODE.

DISCONNECT THE
A/C-HEATER CONTROL
"C1" 12-WAY HARNESS
CONNECTOR.**
FIG. 1
DISCONNECT THE BODY
CONTROL MODULE C2
HARNESS CONNECTOR. **
S EE GENERAL INFO 4.0
WITH AN OHMMETER,
MEASURE BETWEEN
SENSOR GROUND AND
THE MODE SWITCH
MUX CKT. FIG. 1
*Perform Verification TEST VER-2A.
PUT THE MODE
SWITCH IN THE
RECIRC/BI-LEVEL
(FULL LEFT)
POSITION.
WITH THE DRB ENTER
"BODY COMPUTER" THEN
"SENSORS" AND READ
THE "MODE SWITCH
MUX" VOLTAGE.
OBSERVE THE "MODE
SWITCH MUX"
VOLTAGE.
KEY OFF. USING AN
OHMMETER, MEASURE
BETWEEN GROUND AND
THE MODE SWITCH
MUX CKT. FIG. 1
**Check connectors - Clean / repair as necessary.
397
IS THE VOLTAGE NO
APPROXIMATELY 0.45
VOLTS OR LOWER?
YES
IS THE VOLTAGE YES
APPROXIMATELY 5.0
VOLTS?
NO
IS THE RESISTANCE YES
BELOW 100.0 OHMS?
NO
IS THE RESISTANCE YES
BELOW 5.0 OHMS?
NO
CONTINUE TEST
2A ON THE NEXT
PAGE.
REPLACE THE
A/C-HEATER CONTROL
HEAD.*
REPAIR THE MODE
SWITCH MUX CIRCUIT
FOR A SHORT TO
GROUND.*
REPAIR THE MODE
SWITCH MUX CIRCUIT
FOR A SHORT TO THE
SENSOR GROUND
CIRCUIT.*
REPLACE THE BODY
CONTROL MODULE.*
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