Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Driver Seat Schematics , Passenger Seat Schematics , and Rear Seat Schematics DEFINITION: One or more of a heated/cooled seat function is inoperative but the switch indicators operate normal. | ||||
1 | Did you review the Heated/Cooled Seats Description and Operation and perform the necessary inspections? | -- | Go to Step 2 | Go to Symptoms - Seats |
2 | Verify the fault is present. Does the system operate normally? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Do the heat/cool seat switch indicators operate normally? | -- | Go to Step 4 | |
4 | Do either of the blower motors operate for at least 4 seconds? | -- | Go to Step 7 | Go to Step 5 |
5 |
Does the mode signal circuit voltage begin at battery positive in OFF and change each time the next operating mode is selected? | -- | Go to Step 9 | Go to Step 6 |
6 |
Is the circuit voltage at or near the specified value? | 12 V | Go to Step 31 | Go to Step 8 |
7 |
Does the back only heat mode operate normally for more than 1 minute? | -- | Go to Step 12 | Go to Step 13 |
8 | Test the mode signal circuit for an open or short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 9 |
9 |
Does the test lamp illuminate? | -- | Go to Step 10 | Go to Step 28 |
10 | Connect a test lamp from the ignition voltage supply circuit terminal in the CCSM harness connector to a good ground. Does the test lamp illuminate? | -- | Go to Step 11 | Go to Step 29 |
11 | Connect a test lamp from battery voltage to the ground circuit terminal in the CCSM harness connector. Does the test lamp illuminate? | -- | Go to Step 32 | Go to Step 30 |
12 |
Does the seat cushion blower motor operate for at least several seconds? | -- | Go to Step 14 | Go to Step 18 |
13 |
Does the seat back blower motor operate for at least several seconds? | -- | Go to Step 16 | Go to Step 20 |
14 |
Is the resistance within the specified values? | 0.5-7 ohms | Go to Step 15 | Go to Step 33 |
15 | Measure the resistance through the seat cushion temperature sensor from the heat and cool control circuit terminals in the ventilation module connector. Is the resistance within the specified values? | 500 ohms-10K ohms | Go to Step 22 | Go to Step 33 |
16 |
Is the resistance within the specified values? | 0.5-7 ohms | Go to Step 17 | Go to Step 34 |
17 | Measure the resistance through the seat back temperature sensor from the heat and cool control circuit terminals in the ventilation blower connector. Is the resistance within the specified values? | 500 ohms-10K ohms | Go to Step 23 | Go to Step 34 |
18 |
Is the voltage greater than the specified value? | 4 V | Go to Step 19 | Go to Step 24 |
19 |
Is the voltage at or near the specified value? | 12 V | Go to Step 33 | Go to Step 25 |
20 |
Is the voltage greater than the specified value? | 4 V | Go to Step 21 | Go to Step 26 |
21 |
Is the voltage at or near the specified value? | 12 V | Go to Step 34 | Go to Step 27 |
22 | Test the seat cushion TED control and temperature sensor circuits from the CCSM to the seat cushion ventilation blower connector for opens or shorts to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 32 |
23 | Test the seat back TED control and temperature sensor circuits from the CCSM to the seat back ventilation blower connector for opens or shorts to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 32 |
24 | Test the seat cushion blower control and low reference circuits from the CCSM to the seat cushion ventilation blower connector for opens or shorts to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 32 |
25 | Test the seat cushion blower logic voltage circuit from the CCSM to the seat cushion ventilation blower connector for an open or short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 39 | Go to Step 32 | |
26 | Test the seat back blower control and low reference circuits from the CCSM to the seat cushion ventilation blower connector for opens or shorts to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 32 |
27 | Test the seat back blower logic voltage circuit from the CCSM to the seat cushion ventilation blower connector for an open or short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 39 | Go to Step 32 | |
28 | Repair the battery voltage supply circuit to the CCSM for an open or short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 39 | -- |
29 | Repair the ignition voltage supply circuit to the CCSM for an open or short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 39 | -- |
30 | Repair the CCSM ground circuit for an open or high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 39 | -- |
31 | Inspect for poor connections at the heat/cool seat switch signal converter. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 35 |
32 | Inspect for poor connections at the CCSM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 36 |
33 | Inspect for poor connections at the seat cushion ventilation blower connector. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 37 |
34 | Inspect for poor connections at the seat back ventilation blower connector. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 38 |
35 | Replace the heat/cool seat switch signal converter. Refer to Passenger Seat Cushion Ventilation Heating and Cooling Module Replacement . Is the repair complete? | -- | Go to Step 39 | -- |
36 | Replace the CCSM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Is the repair complete? | -- | Go to Step 39 | -- |
37 | Replace the heat/cool seat cushion ventilation blower. Refer to Driver Seat and Passenger Seat Cushion Ventilation Heating and Cooling Blower Replacement or to Rear Seat Cushion Ventilation Heating and Cooling Blower Replacement . Is the repair complete? | -- | Go to Step 39 | -- |
38 | Replace the heat/cool seat back ventilation blower. Refer to Driver Seat and Passenger Seat Back Ventilation Heating and Cooling Blower Replacement or to Rear Seat Back Ventilation Heating and Cooling Blower Replacement . Is the repair complete? | -- | Go to Step 39 | -- |
39 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 |
