Pinpoint Test I: DTC B113E
Climate Control System
Pinpoint Test I: DTC B113E
Refer to Wiring Diagram Set 55, Automatic Climate Control System for schematic and connector information. Diagrams By Number
Normal Operation
Under normal operation, ground is provided to the rear climate control switch. When the switch is pressed, ground through an internal resistor is sent to the Rear Audio and Temperature Control (RATC) module.
- DTC B113E (Rear Climate Control Switch Circuit Short To Ground) - The module senses excessive voltage drop on the switch output circuit, indicating a short directly to ground.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Rear climate control switch
- RATC module
PINPOINT TEST I: DTC B113E
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I1 CHECK CIRCUIT 1349 (PK/LG) FOR GROUND
- Ignition OFF.
- Disconnect: RATC Module C3160a.
- Measure the resistance between RATC module C3160a-4 pin 4, circuit 1349 (PK/LG), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to I2.
No
GO to I3.
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I2 CHECK CIRCUIT 1349 (PK/LG) FOR A SHORT TO GROUND
- Disconnect: Rear Climate Control Switch C3161.
- Measure the resistance between RATC module C3160a-4 pin 4, circuit 1349 (PK/LG), harness side and ground.
- Is the resistance greater than 10,000 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 1349 (PK/LG) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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I3 CHECK RATC MODULE CONNECTION
- Inspect the module connectors for:
- corrosion.
- pushed-out terminals.
- damaged terminals.
- Connect and correctly seat all the RATC module connectors.
- Clear the DTCs.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new RATC module. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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