S1508000480
Service Bulletin Details
Public Details for: S1508000480
Speed control operates intermittently
- 2019 - 2018 - 2017 - 2016 - 2015 - 2014 - 2013 - 2012 - 2011 -
Models from 2019
2019 RAM 1500 |
2019 RAM 2500 |
2019 RAM 3500 |
2019 RAM 4500 |
Models from 2018
2018 RAM 1500 |
2018 RAM 2500 |
2018 RAM 3500 |
2018 RAM 4500 |
Models from 2017
2017 RAM 1500 |
2017 RAM 2500 |
2017 RAM 3500 |
2017 RAM 4500 |
Models from 2016
2016 CHRYSLER TOWN AND COUNTRY |
2016 DODGE CARAVAN |
2016 DODGE DART |
2016 DODGE JOURNEY |
2016 JEEP COMPASS |
2016 JEEP WRANGLER |
2016 RAM 1500 |
2016 RAM 2500 |
2016 RAM 3500 |
2016 RAM 4500 |
Models from 2015
2015 CHRYSLER TOWN AND COUNTRY |
2015 DODGE CARAVAN |
2015 DODGE DART |
2015 DODGE JOURNEY |
2015 JEEP COMPASS |
2015 JEEP WRANGLER |
2015 RAM 1500 |
2015 RAM 2500 |
2015 RAM 3500 |
2015 RAM 4500 |
Models from 2014
Models from 2013
Models from 2012
Models from 2011
STAR ONLINE PUBLICATION Case Number: S1508000480 Release Date: 03/27/2020 Symptom/Vehicle Issue: Speed Control Operates Intermittently Discussion: Cruise/Speed control operation is intermittent. The customer may complain about the cruise control that does not operate at times. A new switch replacement may not correct the concern. Check for one of, or more of the following DTC’s: P0579, P0591, P0579-00, P0591-00 and/or P0585. DS (2011 to 2019), JC (2011 to 2016), JK (2011 to 2016), LC (2011 to 2014, LD, (2011 to 2014), LX (2011 to 2014), and PF (2013 to 2016) vehicles will display the DTC’s in the SCCM). JK, MK, and RT (2011 to 2016) vehicles will display the DTC’s in the PCM. DTC’s will be stored always upon initial investigation. DTC’s will go active only if the cruise does not turn on when the On/OFF button is pushed and will remain active only during the duration of the button press. If the cruise is turning on at the time of the investigation the DTC’ will remain stored even if the ON/OFF button is pressed. Fig 1 For D-Family, JC, JK, LC, LD, LX, MK, and RT vehicles: 1. Using Wi-tech measure the S/C input voltages for S/C voltage inputs 1 and 2 signals while pushing and holding the on button (see Fig 1 and Fig 2, Fig 3 for voltage monitoring). This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the appropriate course of action. Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no solution is found FCA US LLC Version 4.2 02/06/2017 STAR ONLINE PUBLICATION Fig 2 This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the appropriate course of action. Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no solution is found FCA US LLC Version 4.2 02/06/2017 STAR ONLINE PUBLICATION If the cruise control icon does not display in the cluster, one or both of the signal voltages may be over the Vmax value; 0.353 (Signal 1) or 0.980 (Signal 2); see Fig 3. Once one of these voltages exceeds the Vmax value the system will disable the cruise control and prevent it from turning on since a voltage is out of the parameters that the system recognizes in order to determine a legitimate button press. The voltage that is exceeding the value, i.e., Signal 1 or Signal 2, will determine the DTC that is set. If Signal 1 voltage is over Vmax, P0579 will be set. If Signal 2 voltage is over Vmax, P0591 will be set. Again the DTC’s only remain active during the time the on button is being pressed. Once the button is released the voltages will increase to approximately 4.54 volts. Since this value is within the range of voltages when no button is being pressed, the system is seeing a correct voltage and therefore does not show an active DTC (see Fig 3). Signal 1 Cruise Control voltage Values Function Vmin Vnom Vmax Circuit Low 0.000 -0.216 ON/OFF 0.235 0.300 0.353 Cancel 0.784 0.890 0.980 Distance 1.373 1.500 1.627 Mode 1.941 2.100 2.235 SET2.549 2.700 2.843 RES+ 3.137 3.300 3.451 None 4.373 4.540 4.686 Circuit High 4.706 5.000 Signal 2 Cruise Control voltage Values Function Vmin Vnom Vmax Circuit Low 0.000 -0.784 ON/OFF 0.804 0.900 0.980 Cancel 1.353 1.500 1.608 Distance 1.941 2.100 2.235 Mode 2.529 2.700 2.843 SET3.137 3.300 3.451 RES+ 3.725 3.900 4.059 None 4.373 4.540 4.686 Circuit High 4.706 5.000 Fig 3 2. If, one or more of these voltages is over Vmax, follow the procedures in DealerConnect for removing the airbag/horn switch assembly in the steering wheel. Once the airbag/horn switch assembly has been removed, disconnect the 6 pin steering wheel harness connector to the SCCM/clock spring assembly and reconnect it. Re-measure the S/C Signal voltages while pushing and holding the ON/OFF button. If the voltages drop to the nominal values, 0.290/0.300 (Signal 1) and 0.890/0.90 (Signal 2) the intermittent cruise problem has been corrected. Any contamination/oxidation that was present on the connector terminals that was causing an increase in resistance, which resulted in the increased voltage or voltages, was brushed aside or removed during the re-installation of the connector. Re-install the This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the appropriate course of action. Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no solution is found FCA US LLC Version 4.2 02/06/2017 STAR ONLINE PUBLICATION airbag/horn switch assembly and return the vehicle to the customer. No other repairs are necessary. 3. If, the cruise control ready icon does display in the cluster, and the signal input voltages are not at Vnom, i.e., 0.290/0.300 (Signal 1), or 0.890/0.900 (Signal 2), but are slightly higher, ie., 0.320 to 0.350 (Signal 1) or 0.920 to 0.979 (Signal 2), follow the procedures in DealerConnect for removing the airbag/horn switch assembly from the steering wheel. Once the airbag/horn switch assembly has been removed, disconnect the 6-pin steering wheel harness connector (Uplink Connector) to the SCCM/clock spring assembly and reconnect it. Re-measure the S/C Signal voltages while pushing and holding the on button. If the voltages drop to the nominal values, 0.290/0.300 volts the intermittent cruise problem has been corrected. Note: If the voltages do not drop to the nominal values, perform the same disconnect and reconnect procedure to the 6-pin connector (Downlink Connector) on the opposite side of the SCCM. 4. If the cruise control Signal voltages are at Vnom, graph the speed control input voltages on the same screen while pushing and releasing the on button. If the switch is performing correctly, the input voltages will be almost a mirror image of each other as shown below in Fig 4. Fig 4 This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the appropriate course of action. Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no solution is found FCA US LLC Version 4.2 02/06/2017 STAR ONLINE PUBLICATION If the switch is not performing correctly, the switch voltages may not be a mirror image of each other as shown below in Fig 5. Signal 1 voltage should have dropped here. Contact 1 did not close. Replace switch. Fig. 5 Signal 1 switch contact did not close when signal 2 closed. This can cause a P0579 and the cruise will not turn on. In this case, the S/C switch should be replaced. Verification: Test the operation to complete. This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the appropriate course of action. Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no solution is found FCA US LLC Version 4.2 02/06/2017