Diagnostic Procedure
PASSENGER SEAT HEAT OUTPUT OPEN SYMPTOM CHART
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | With the DRBIII®, erase the DTC from Memory/Heated Seat Adjustable Pedal Module. Turn the ignition switch to the Off position then start the engine and let run for one minute. Operate the heated seat system. With the DRBIII® check for the same DTC to reset in the MHSAPM. Did the same DTC reset? Yes --> Go To 2 No --> Using the wiring schematic as a guide, inspect the wiring and connectors for an intermittent condition. Check for an intermittent open cushion or seat back element by applying pressure to seat with the heater on and watch the DRBIII for the DTC to reset. Perform BODY VERIFICATION TEST - VER 1 . |
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| 2 | Turn ignition off. Disconnect the Passenger Heated Seat Cushion 4-way connector. Disconnect the Memory Heated Seat Adjustable Pedal Module C1 connector. Measure the resistance of the Passenger Seat Heater B(+) Driver circuit between the MHSAPM C1 connector and the Passenger Heated Seat Cushion 4-way connector, harness side. Is the resistance below 1.5 ohms? Yes --> Go To 3 No --> Repair the open Passenger Seat Heater B(+) Driver wire. Perform BODY VERIFICATION TEST - VER 1 . |
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| 3 | Reconnect the Passenger Heated Seat Cushion 4-way connector if disconnected. Disconnect the MHSAPM C1 connector. Disconnect the Passenger Heated Seat Back 2-way connector. Measure the resistance of the Passenger Seat Heater Ground circuit from the MHSAPM C1 connector to the Passenger Heated Seat Back 2-way connector (harness side). Is the resistance below 1.0 ohms? Yes --> Go To 4 No --> Repair the Passenger Seat Heater Ground circuit for an open. Perform BODY VERIFICATION TEST - VER 1 . |
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| 4 | Disconnect the Passenger Heated Seat Cushion 4-way connector. Disconnect the Passenger Heated Seat Back 2-way connector. Measure the resistance of the SEAT CUSHION HEATER ELEMENT by connecting one lead to the Passenger Seat Heater B(+) Driver terminal and the other lead to the Passenger Seat Heater Ground in the Heated Seat Cushion 4-way connector (seat side). Is the resistance below 5.0 ohms? Yes --> Go To 5 No --> Repair the pigtail wiring or replace the Passenger Heated Seat Cushion/Element as necessary. Perform BODY VERIFICATION TEST - VER 1 . |
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| 5 | Disconnect the Passenger Heated Seat Back 2-way connector. Measure the resistance of the SEAT BACK HEATER ELEMENT by connecting one lead to the Heated Seat Driver terminal and the other to the Passenger Seat Heater Ground terminal in the Heated Seat Back 2-way connector. Is the resistance below 5.6 ohms? Yes --> Replace the Memory Heated Seat Adjustable Pedal Module. Perform BODY VERIFICATION TEST - VER 1 . No --> Repair the pigtail wiring or replace the Passenger Heated Seat Back/Element as necessary. Perform BODY VERIFICATION TEST - VER 1 . |
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