j6henry Posted November 12, 2006 Report Share Posted November 12, 2006 None of my seat heaters work. I checked all four fuses. I see on the schematic that their is an inhibit module. Anyone familiar with the operation of this module??? Link to comment Share on other sites More sharing options...
JohnnyG Posted November 13, 2006 Report Share Posted November 13, 2006 I don't know for sure, but it may have something to do with "selective shutdown" of non-essential systems. Whereas, if your battery voltage drops below a certain level, certain systems will shut off in a logical planned sequence, always trying to leave enough juice to keep the engine running and to get you home. Check your battery voltage and you battery cable connections first. If the battery is original, or you live in an area where batteries are prone to early failure, replace it. Never underestimate the amount of a persons greed. Link to comment Share on other sites More sharing options...
JimD Posted November 13, 2006 Report Share Posted November 13, 2006 Are the '01 seats heated and cooled? I'm thinking they are heated only. Page 8-903 for my reference '04. Heated only would be similar to my '98. There could be a fuse identified as IGN 3 RR in the box under the rear seat cushion. Check that one also as it is common to all 4 seat temperature control modules. Page 8-1382 for my reference '98. Edit: You might pull the codes for a clue. There are at least 2 "B" codes related to heated seats. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
JIMDTS Posted November 13, 2006 Report Share Posted November 13, 2006 Here's some info from the gm service manual Document ID # 716437 2001 Cadillac DeVille -------------------------------------------------------------------------------- Heated Seat Inoperative Step Action Value(s) Yes No Schematic Reference: 1 Did you perform the Diagnostic System Check - Power Seat Systems? -- Go to Step 2 Go to 2 Verify that the Heated Seat Inoperative complaint is present. Does the heated seat system operate as described in the description and operation? -- Go to in Wiring Systems Go to Step 3 3 Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, observe the Heated Seat Temperature parameter in the Door Module input data list. Activate the heated seat HEAT/OFF switch. Does the Heated Seat Temperature parameter momentarily change state? -- Go to Step 6 Go to Step 4 4 Measure the voltage from the battery voltage circuit of the heated seat switch to a good ground. Does the voltage measure within the specified range? 9-15 V Go to Step 5 Go to Step 23 5 Probe the heated seat temperature signal circuit of the heated seat switch with a test lamp that is connected to a good ground. Activate the heated seat HEAT/OFF switch. Does the test lamp illuminate? -- Go to Step 26 Go to Step 30 6 Measure the voltage from the battery positive voltage circuit of the heated seat module to a good ground. Does the voltage measure within the specified range? 9-15 V Go to Step 7 Go to Step 32 7 Measure the voltage from the battery positive voltage circuit of the heated seat module to the ground circuit of the heated seat module. Does the voltage measure within the specified range? 9-15 V Go to Step 8 Go to Step 33 8 Measure the voltage from the Ignition 3 voltage circuit of the heated seat module to a good ground. Does the voltage measure within the specified range? 9-15 V Go to Step 9 Go to Step 34 9 Measure the voltage from the heated seat temperature signal circuit of the heated seat module to a good ground. Press the heated seat HEAT/OFF switch. Does the measured voltage momentarily change state? -- Go to Step 11 Go to Step 10 10 Turn Off the ignition. Disconnect the door module connector C3. Turn ON the ignition, with the engine OFF. Measure the voltage from the heated seat temperature signal circuit of the door module connector to a good ground. Does voltage measure with the specified range? 4.50-5.50 V Go to Step 28 Go to Step 24 11 Disconnect the heated seat module connector C1. Connect a test lamp from battery positive voltage to the heated seat back only mode signal circuit of the module connector. Does the test lamp illuminate? -- Go to Step 27 Go to Step 12 12 Disconnect the heated seat module harness connector C2. Measure the resistance between the heated seat element supply voltage circuit and the heated seat element control circuit of the heated seat cushion heating element. Does the resistance measure less than the specified value? 10 ohms Go to Step 13 Go to Step 20 13 Measure the resistance between the heated seat element supply voltage circuit and the heated seat element control circuit of the seat back heating element. Does the resistance measure less than the specified value? 10 ohms Go to Step 14 Go to Step 20 14 Important If the resistance is measured with the seat still warm, the resistance may vary within the specified range depending on the temperature of the seat. Measure the resistance between the temperature sensor signal circuit and the sensor low reference circuit of the seat cushion temperature sensor. Does the resistance measure within the specified range? 280 ohms-300 K ohms Go to Step 15 Go to Step 21 15 Important If the resistance is measured with the seat still warm, the resistance may vary within the specified range depending on the temperature of the seat. Measure the resistance between the temperature sensor signal circuit and the sensor low reference circuit of the seat back temperature sensor. Does the resistance measure within the specified range? 280 ohms -300 K ohms Go to Step 16 Go to Step 21 16 Test the heated seat element control circuits between the heated seat module and the seat heating elements for a short to ground. Refer to and in Wiring Systems. Did you find and correct the condition? -- Go to Step 39 Go to Step 17 17 Test the temperature sensor signal circuits between the heated seat module and the temperature sensors for a short to ground. Refer to and in Wiring Systems. Did you find and correct the condition? -- Go to Step 39 Go to Step 18 18 Test for continuity between the temperature sensor signal circuits and the heated seat element supply voltage circuits of the heated seat module connector C2. Refer to and in Wiring Systems. Did you find and correct the condition? -- Go to Step 39 Go to Step 19 19 Test the heated seat element control circuit between the heated seat module and the seat heating element for a short to battery voltage. Refer to and in Wiring Systems. Did you find and correct the condition? -- Go to Step 39 Go to Step 29 20 Test the heated seat element supply voltage circuit and the heated seat element control circuit between the heated seat module and the seat heating element for a high resistance or an open. Refer to and in Wiring Systems. Did you find and correct the condition? -- Go to Step 39 Go to Step 31 21 Test the temperature sensor signal circuit and the sensor low reference circuit between the heated seat module and the temperature sensor for a high resistance or an open. Refer to and in Wiring Systems. Did you find and correct the condition? -- Go to Step 39 Go to Step 22 22 Test the temperature sensor signal circuit and the sensor low reference circuit between the heated seat module and the heating element for a short to battery voltage. Refer to and in Wiring Systems. Did you find and correct the condition? -- Go to Step 39 Go to Step 31 23 Test the heated seat switch supply voltage circuit between the door control module and the heated seat switch for an open. Refer to and in Wiring Systems. Did you find and correct the condition? -- Go to Step 39 Go to Step 28 24 Test the heated seat temperature signal circuit between the door module and the heated seat module for a short to ground or an open. Refer to and in Wiring Systems. Did you find and correct the condition? -- Go to Step 39 Go to Step 25 25 Test the heated seat temperature signal circuit between the door module and the heated seat module for a short to battery voltage. Refer to and in Wiring Systems. Did you find and correct the condition? -- Go to Step 39 Go to Step 29 26 Test the heated seat temperature switch signal circuit between the heated seat switch and the door module for an open. Refer to and in Wiring Systems. Did you find and correct the condition? -- Go to Step 39 Go to Step 28 27 Test the heated seat back only mode signal circuit between the door module and the heated seat module for a short to ground. Refer to and in Wiring Systems. Did you find and correct the condition? -- Go to Step 39 Go to Step 28 28 Inspect for poor connections at the harness connector of the door control module. Refer to and in Wiring Systems. Did you find and correct the condition? -- Go to Step 39 Go to Step 35 29 Inspect for poor connections at the harness connector of the heated seat module. Refer to and in Wiring Systems. Did you find and correct the condition? -- Go to Step 39 Go to Step 37 30 Inspect for poor connections at the harness connector of the heated seat switch. Refer to and in Wiring Systems. Did you find and correct the condition? -- Go to Step 39 Go to Step 36 31 Inspect for poor connections at the harness connector of the suspect heated seat cushion or seat back heating element/sensor assembly. Refer to and in Wiring Systems. Did you find and correct the condition? -- Go to Step 39 Go to Step 38 32 Repair the open or short to ground in the battery positive voltage circuit of the heated seat module. Refer to in Wiring Systems. Did you complete the repair? -- Go to Step 39 -- 33 Repair the open in the ground circuit of the heated seat module. Refer to in Wiring Systems. Did you complete the repair? -- Go to Step 39 -- 34 Repair the open in the Ignition 3 voltage circuit of the heated seat module. Refer to in Wiring Systems. Did you complete the repair? -- Go to Step 39 -- 35 Replace the door control module. Refer to in Doors. Did you complete the replacement? -- Go to Step 39 -- 36 Replace the heated seat switch. Refer to or . Did you complete the replacement? -- Go to Step 39 -- 37 Replace the heated seat module. Refer to or . Did you complete the replacement? -- Go to Step 39 -- 38 Replace the appropriate heated seat cushion or seat back heater/sensor assembly. Refer to , , , or . Did you complete the replacement? -- Go to Step 39 -- 39 Operate the system in order to verify the repair. Did you correct the condition? Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.