Pinpoint Test P: DTC B113F — Rear Climate Control Switch Circuit Short To Battery
Refer to Wiring Diagrams Cell
55
, Automatic Climate Control System for schematic and connector information.
Normal Operation
Under normal operation, ground is provided to the rear climate switch through circuit 676 (PK/OG). When the switch pressed, ground through an internal resistor is sent to the rear
redundant control module (RRCM) through circuit 1349 (PK/LG).
Possible Causes
An open in circuit 676 (PK/OG) or 1349 (PK/LG)
A short to voltage in circuit 1349 (PK/LG)
Rear climate switch
PINPOINT TEST P: DTC B113E — REAR CLIMATE CONTROL SWITCH CIRCUIT SHORT TO BATTERY
Component Tests
Temperature Sensor — Ambient
Connect the properly seat all of the RRCM connectors.
Operate the system.
Does the concern return?
Test Step
Result / Action to Take
P1 CHECK CIRCUIT 1349 (PK/LG) FOR AN OPEN
Ignition OFF.
Disconnect: Rear Redundant Control Module (RRCM) C3160a.
Disconnect: Rear climate control switch C3161.
Measure the resistance between RRCM C3160a-4 pin 4, circuit 1349 (PK/LG) and the rear climate
control switch C3161-2, circuit 1349 (PK/LG).
Is the resistance less than 5 ohms?
Yes
GO to
P2
.
No
REPAIR circuit 1349 (PK/LG) for an open. CLEAR the DTCs. REPEAT
the self-test. TEST the system for normal operation.
P2 CHECK CIRCUIT 1349 (PK/LG) FOR A SHORT TO VOLTAGE
Measure the voltage between rear climate control switch C3161-2, circuit 1349 (PK/LG) and
ground.
Is voltage present?
Yes
REPAIR circuit 1349 (PK/LG) for a short to voltage. CLEAR the DTCs.
REPEAT the self-test. TEST the system for normal operation.
No
GO to
P3
.
P3 CHECK CIRCUIT 676 (PK/OG) FOR GROUND
Measure the resistance between rear climate control switch C3161-3, circuit 676 (PK/OG) and
ground.
Is the resistance less than 5 ohms?
Yes
INSTALL a new rear climate control switch. CLEAR the DTCs.
REPEAT the self-test. TEST the system for normal operation.
No
REPAIR circuit 676 (PK/OG) for an open. CLEAR the DTCs. REPEAT
the self-test. TEST the system for normal operation.
Page 42 of 45
2006 Town Car Workshop Manual
12/30/2011
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