Pinpoint Test AI: DTC B19A7
Seats
Pinpoint Tests
Pinpoint Test AI: DTC B19A7
Refer to Wiring Diagram Set 119 (Fusion/Milan/MKZ, Fusion Hybrid/Milan Hybrid), Climate Controlled Seats for schematic and connector information. Diagrams By Number
Normal Operation
The Dual Climate Controlled Seat Module (DCSM) supplies a speed control signal voltage to the driver seat cushion Thermo-Electric Device (TED) on circuit VHS18 (BN/GN). The TED blower is supplied operating voltage from DCSM output circuit CHS03 (GN/BN) and ground from DCSM output circuit RHS03 (GY/OG).
- DTC B19A7 (Driver Seat Cushion Blower Speed Short to Ground) - If the driver seat cushion blower speed circuit is shorted to ground, the DCSM will shut down the driver seat system and set this DTC.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- TED and blower assembly
- DCSM
PINPOINT TEST AI: DTC B19A7
NOTICE: When taking measurements at Dual Climate Controlled Seat Module (DCSM) harness connectors, do not insert the electrical probes into the female connector pins. Inserting the probes into connector pins can cause intermittent or open electrical connections after reassembly resulting in Diagnostic Trouble Codes (DTCs) and system failure. Touching the tip of these connector pins is recommended instead.
NOTE: The air bag warning indicator illuminates when the correct Restraints Control Module (RCM) fuse is removed and the ignition switch is ON.
NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.
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AI1 CHECK THE CUSHION TED BLOWER MOTOR SPEED CONTROL CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the
General Procedures portion of Restraint Systems.
- Disconnect: Driver Seat Side Air Bag C327 .
- Disconnect: Passenger Seat Side Air Bag C313 .
- Disconnect: DCSM C3305c .
- Disconnect: Cushion TED C3300 .
- Measure the resistance between DCSM C3305c-11, circuit VHS18 (BN/GN), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to AI2.
No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.
CONNECT driver seat side air bag module C327.
CONNECT passenger seat side air bag module C313.
REPOWER the SRS. REFER to Restraint Systems.
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AI2 CHECK THE CUSHION TED BLOWER MOTOR SPEED CONTROL AND BLOWER MOTOR GROUND CIRCUITS FOR A SHORT TOGETHER
- Measure the resistance between DCSM C3305c-11, circuit VHS18 (BN/GN), harness side and C3305c-15, circuit RHS03 (GY/OG), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
INSTALL a new cushion TED. REFER to Seat Cushion Thermo-Electric Device Seat Cushion Thermo-Electric Device. REPEAT the self-test. CLEAR the DTCs.
DISCONNECT the battery ground cable.
CONNECT driver seat side air bag module C327.
CONNECT passenger seat side air bag module C313.
REPOWER the SRS. REFER to Restraint Systems.
No
REPAIR the circuits. REPEAT the self-test. CLEAR the DTCs.
CONNECT driver seat side air bag module C327.
CONNECT passenger seat side air bag module C313.
REPOWER the SRS. REFER to Restraint Systems.
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