Pinpoint Test G: DTC B2268 or B2269
Climate Control System
Pinpoint Tests
Pinpoint Test G: DTC B2268 or B2269
Refer to Wiring Diagram Set 55, Automatic Climate Control System for schematic and connector information. Diagrams By Number
Normal Operation
Under normal operation, the steering wheel control switch receives a ground through circuit 57 (BK). The HVAC module senses the resistance (depending on what button is pressed) from the steering wheel control switch through circuit 1070 (BN/LB).
- DTC B2268 Steering Wheel Control Switch Open Circuit - The module senses no voltage drop on the reference voltage circuit, indicating an open circuit.
- DTC B2269 Steering Wheel Control Switch Circuit Short to Ground - The module senses excessive voltage drop on the reference voltage circuit, indicating a short directly to ground.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Steering wheel control switch
- HVAC module
PINPOINT TEST G: DTC B2268 OR B2269
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G1 CHECK THE INPUT TO THE HVAC MODULE
- Ignition OFF.
- Disconnect: HVAC Module C228b.
- Measure the resistance between HVAC module C228b-7, circuit 1070 (BN/LB), harness side and ground.
- Is the resistance reading between 4,500 and 5,000 ohms?
Yes
GO to G2.
No
If the resistance is less than 4,500 ohms, GO to G3.
If the resistance is greater than 5,000 ohms, GO to G4.
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G2 CHECK THE STEERING WHEEL AUXILIARY CONTROL SWITCH OUTPUT
- Measure the resistance between HVAC module C228b-7, circuit 1070 (BN/LB), harness side and ground.
- Press each steering wheel auxiliary control switch and compare the resistance reading to the chart below.
- Are the resistance readings within the range?
Yes
GO to G6.
No
INSTALL a new steering wheel auxiliary control switch. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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G3 CHECK CIRCUIT 1070 (BN/LB) FOR A SHORT TO GROUND
- Disconnect: Steering Wheel Control Switch.
- Measure the resistance between HVAC module C228b-7, circuit 1070 (BN/LB), harness side and ground.
- Is the resistance reading less than 10,000 ohms?
Yes
REPAIR circuit 1070 (BN/LB) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
INSTALL a new steering wheel auxiliary control switch. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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G4 CHECK CIRCUIT 1070 (BN/LB) FOR AN OPEN
- Disconnect: Steering Wheel Auxiliary Control Switch.
- Measure the resistance between HVAC module C228b-7, circuit 1070 (BN/LB), harness side and steering wheel auxiliary control switch C2208-6, circuit 1070 (BN/LB), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to G5.
No
REPAIR circuit 1070 (BN/LB) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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G5 CHECK CIRCUIT 57 (BK) FOR AN OPEN
- Measure the resistance between steering wheel auxiliary control switch C2208-3, circuit 57 (BK), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
INSTALL a new steering wheel auxiliary control switch. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
REPAIR circuit 57 (BK) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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G6 CHECK HVAC MODULE CONNECTION
- Carry out the HVAC Module Cold Boot Process. HVAC Module Cold Boot Process
- Carry out the HVAC Module On-Demand Self Test. HVAC Module Self-Test
- Operate the system.
- Does the concern return?
Yes
INSTALL a new HVAC 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. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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