Module Communications Network System: Other Mercury Monterey VIII

Smart Junction Box (SJB)

The SJB is connected to the standard corporate protocol (SCP) communication network. The SJB controls both interior and exterior lighting, body functions, and active anti-theft functions. In the absence of the dual automatic temperature control (DATC) module, the SJB receives input from the function selector switch to operate the manual climate control system. If one of the bus wires becomes shorted to ground or voltage, communications can continue at a degraded level. Check circuits 914 (TN/OG), and 915 (PK/LB) between the SJB C2280b and the diagnostic link connector (DLC) C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the SCP network, damage to the DLC C251, or damage to the SJB C2280b. The SJB is a combination of a multifunction control module and an interior power junction box. SJB functions control multiple systems which include

1. illuminated entry and interior lamps
2. exterior lamps
3. perimeter alarm
4. power door locks
5. auto-locks and smart locks
6. keyless entry keypad
7. remote keyless entry (RKE)
8. warning chimes

The SJB is equipped on all vehicles and is located behind the LH dash closeout panel. For removal information, refer to MULTIFUNCTION ELECTRONIC MODULES . For additional information on interior lamps and illuminated entry, refer to INTERIOR LIGHTING . For additional information on exterior lighting, refer to EXTERIOR LIGHTING . For additional information on power door locks, RKE keypad and RKE, refer to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS . For additional information on power windows, refer to GLASS, FRAMES AND MECHANISMS . For additional information on anti-theft, refer to ANTI-THEFT . For additional information on the manual climate control system, refer to CLIMATE CONTROL SYSTEM-GENERAL INFORMATION . For additional information on the warning chimes, refer to WARNING DEVICES .

Driver Seat Module (DSM)

The DSM is on the universal asynchronous receiver-transmitter (UART)-based protocol (UBP) communication network, circuit 2077 (PK/LB). The DSM controls the positioning and programming of the driver seat and memory exterior rear view mirrors. The UBP communication network does not function if the wire is shorted to ground or battery voltage. Check the network circuit between the DSM C341c and the DLC C251. The total resistance value must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the UBP network, damage to the DLC C251, damage to the DSM C341c, or a problem in the in-line connector. The DSM is located under the driver seat. For removal information, refer to MULTIFUNCTION ELECTRONIC MODULES . For additional driver seat information, refer to SEATING . For additional information on exterior rear view mirrors, refer to REAR VIEW MIRRORS .

Powertrain Control Module (PCM)

The PCM is on the SCP communication network. The PCM controls the engine for better fuel economy, emissions control, failure mode detection and storage, and all passive anti-theft system (PATS) functions. If one of the bus wires becomes shorted to ground or voltage, or if some but not all termination resistors are lost, communications can continue at a degraded level. Check the SCP circuits 915 (PK/LB) and 914 (TN/OG) between the PCM C175 and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the SCP network, damage to the DLC C251, damage to the PCM C175, or a problem in the in-line connector. For additional PATS information, refer to ANTI-THEFT - PATS . For additional PCM information, See INTRODUCTION - GASOLINE article.

Instrument Cluster

The instrument cluster is on the SCP communication network. It is an analog face cluster with a digital odometer. The instrument cluster displays a variety of information. If one of the bus wires becomes shorted to ground or voltage, or if some but not all termination resistors are lost, communications can continue at a degraded level. Check the SCP circuits 915 (PK/LB) and 914 (TN/OG) between the instrument cluster C220a and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the SCP network, damage to the DLC C251, damage to the instrument cluster C220a, or a problem in the in-line connector. For additional information, refer to INSTRUMENT CLUSTER .

Restraint Control Module (RCM)

The RCM is on the international standards organization (ISO) 9141 communication network. The RCM controls the deployment of the air bags based on sensor input. The ISO 9141 communication network does not function if the wire is shorted to ground or battery voltage. Check the network circuit between the RCM C310a and the DLC C251. The total resistance value must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the ISO 9141 communication network, damage to the DLC C251, damage to the RCM C310a, or a problem in the in-line connector. For additional information, refer to SUPPLEMENTAL RESTRAINT SYSTEM .

Anti-Lock Brake System (ABS) Module

The ABS module is on the SCP communication network. The ABS module controls the brake pressure to the 4 wheels to keep the vehicle under control while braking. The ABS module also controls the stability assist and traction control systems (if equipped). If one of the bus wires becomes shorted to ground or battery voltage, or if some but not all termination resistors are lost, communications can continue at a degraded level. Check the SCP circuits 915 (PK/LB) and 914 (TN/OG) between the ABS module C155 and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the SCP network, damage to the DLC C251, damage to the ABS module C155, or a problem in the in-line connector. For additional information, refer to ANTI-LOCK CONTROL .

Dual Automatic Temperature Control (DATC) Module

The DATC module uses the SCP communication network for communication with the diagnostic tool. The DATC module controls automatic climate functions that maintain the vehicle interior temperature at a constant setting. The DATC module also uses the UBP network for communication with the driver or passenger climate controlled seat modules. If one of the bus wires becomes shorted to ground or voltage, or if some but not all termination resistors are lost, communications can continue at a degraded level. Check the SCP circuits 915 (PK/LB) and 914 (TN/OG) between the DATC module C228a and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the SCP network, damage to the DLC C251, damage to the DATC module C228a, or a problem in the in-line connector. For additional information, refer to CLIMATE CONTROL SYSTEM-GENERAL INFORMATION .

Speed Control Actuator

The speed control actuator is connected to the SCP communication network. The speed control system is designed to maintain vehicle speed between 48 and 200 km/h (30 and 125 mph). If one of the bus wires becomes shorted to ground or voltage, or if some but not all termination resistors are lost, communications can continue at a degraded level. Check the SCP circuits 915 (PK/LB) and 914 (TN/OG) between the speed control actuator C122 and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the SCP network, damage to the DLC C251, damage to the speed control actuator C122, or a problem in the in-line connector. For additional information, refer to SPEED CONTROL .

Parking Aid Modules - 4 Sensor and 8 Sensor

The parking aid module is connected to the ISO 9141 communication network. Two versions of this system are available, reverse parking aid with 4 sensors (rear only), and parking aid with 8 sensors (4 additional front sensors). The reverse parking aid module controls sensors in the rear bumper that detect close objects when the transmission is in REVERSE. The second parking aid system incorporates additional front sensors that are operational when the transmission is in DRIVE, and vehicle speed is above 0 km/h and below 8 km/h (5 mph). The ISO 9141 communication network does not function if the wire is shorted to ground or battery voltage. Check the network circuit between the parking aid module C4226 (or C4014 with front sensors) and the DLC C251. The total resistance value must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the UBP network, damage to the DLC C251, damage to the parking aid module connector, or a problem in the in-line connector. For additional information, refer to PARKING AID .

Driver or Passenger Climate Controlled Seat Module

The driver or passenger climate controlled seat module is on the UBP communications network. The climate controlled seat modules communicate with the DATC module to control the heating and cooling elements in the seat for driver/passenger comfort. The UBP communication network does not function if the wire is shorted to ground or battery voltage. Check the network circuit between the climate controlled seat module C3031a (driver), C3036a (passenger), and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the UBP network, damage to the DLC C251, damage to the climate controlled seat module connector, or a problem in the in-line connector. For additional driver and passenger climate control seat module information, refer to SEATING .

Right Hand (RH) and Left Hand (LH) Power Sliding Door (PSD) Modules

The RH PSD module and the LH PSD module are both connected to the ISO 9141 communication network. The modules control opening and closing of the right and left passenger side doors. The ISO 9141 communication network does not function if the wire is shorted to ground or battery voltage. Check the network circuit between the PSD module in question and the DLC C251. The total resistance value must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the ISO 9141 communication network, damage to the DLC C251, damage to the PSD module connector, or a problem in the in-line connector. For additional information on this system, refer to BODY CLOSURES .

Power Liftgate Module

The power liftgate module is connected to the ISO 9141 communication network. The module controls opening and closing of the vehicle liftgate. The ISO 9141 communication network does not function if the wire is shorted to ground or battery voltage. Check the network circuit between the power liftgate module and the DLC C251. The total resistance value must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the ISO 9141 communication network, damage to the DLC C251, damage to the power liftgate module C4174a, or a problem in the in-line connector. For additional information on this system, refer to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS .

Refer to SYSTEM WIRING DIAGRAMS (Freestar) or SYSTEM WIRING DIAGRAMS (Monterey) for schematic and connector information.

Possible Causes

1. BEC fuses: 58 (30A) 62 (30A) 65 (30A)
2. SCP circuits 914 (TN/OG) and 915 (PK/LB) open
3. power circuits 1052 (TN/BK), 1523 (DG), and 1524 (DB) open, or shorted to ground
4. ground circuit 1205 (BK) open
5. SJB
6. DLC C251
7. SJB connectors C2280a, C2280b, and C2280h

Scheme 21

Scheme 22

Scheme 23

Scheme 24

Scheme 25

1. A1 CHECK THE SJB CONNECTORS FOR DAMAGE Key in OFF position. Disconnect: SJB C2280a, C2280b and C2280h. Inspect the SJB connectors for damage. Are the SJB connectors OK? Yes : GO to A2 . No : REPAIR the SJB connector in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
2. A2 CHECK THE SJB C2280a GROUND CIRCUITS Measure the resistance between the SJB C2280a-1, circuit 1205 (BK), harness side and ground. Is the resistance less than 5 ohms? Yes : GO to A3 . No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
3. A3 CHECK THE SJB C2280h GROUND CIRCUITS Measure the resistance between the SJB C2280h-8, circuit 1205 (BK), harness side and ground; and between the SJB C2280h-22, circuit 1205 (BK), harness side and ground. Are the resistances less than 5 ohms? Yes : GO to A4 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
4. A4 CHECK THE STANDARD CORPORATE PROTOCOL (SCP) NETWORK CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE SJB FOR AN OPEN Measure the resistance between the SJB C2280b-50, circuit 914 (TN/OG), harness side and the DLC C251-2, circuit 914 (TN/OG), harness side. Measure the resistance between the SJB C2280b-51, circuit 915 (PK/LB), harness side and the DLC C251-10, circuit 915 (PK/LB), harness side. Are the resistances less than 5 ohms? Yes : GO to A5 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
5. A5 CHECK THE VOLTAGE TO THE SJB Key in ON position. Measure the voltage between the SJB C2280h-11, circuit 1523 (DG), harness side and ground; and between the SJB C2280h-31, circuit 1524 (DB), harness side and ground; and between the SJB C2280h-32, circuit 1052 (TN/BK), harness side and ground. Are the voltages greater than 10 volts? Yes : GO to A6 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
6. A6 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion push-out pins Connect all the SJB connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new SJB. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-234516) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.

1. BEC fuses: 10 (30A) 51 (10A)
2. UBP circuit 2077 (PK/LB) open
3. circuit 1567 (RD/LB), open or shorted to ground
4. circuit 566 (DG), open or shorted to ground
5. circuit 1203 (BK/LB) open
6. circuit 1205 (BK) open
7. DLC C251
8. DSM

Scheme 26

Scheme 27

Scheme 28

Scheme 29

Scheme 30

1. B1 CHECK THE DSM CONNECTORS FOR DAMAGE Key in OFF position. Disconnect: All DSM Connectors. Inspect the DSM connectors for damage. Are the DSM connectors OK? Yes : GO to B2 . No : REPAIR the DSM connector in question. CARRY OUT the data link diagnostics test.
2. B2 CHECK GROUND CIRCUITS 1205 (BK) AND 1203 (BK/LB) FOR AN OPEN Key in OFF position. Measure the resistance between the DSM C341a-2, circuit 1205 (BK), harness side and ground. Measure the resistance between the DSM C341c-6, circuit 1203 (BK/LB), harness side and ground. Are the resistances less than 5 ohms? Yes : GO to B3 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
3. B3 CHECK UNIVERSAL ASYNCHRONOUS RECEIVER-TRANSMITTER (UART)-BASED PROTOCOL (UBP) NETWORK CIRCUIT 2077 (PK/LB) BETWEEN THE DATA LINK CONNECTOR (DLC) C251 AND THE DSM C341c FOR AN OPEN Measure the resistance between the DSM C341c-2, circuit 2077 (PK/LB), harness side and the DLC C251-3, circuit 2077 (PK/LB), harness side. Is the resistance less than 5 ohms? Yes : GO to B4 . No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
4. B4 CHECK POWER CIRCUITS 1567 (RD/LB) AND 566 (DG) FOR VOLTAGE Key in ON position. Measure the voltage between the DSM C341c-1, circuit 1567 (RD/LB), harness side and ground. Measure the voltage between the DSM C341a-1, circuit 566 (DG), harness side and ground. Are the voltages greater than 10 volts? Yes : GO to B5 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
5. B5 CHECK FOR CORRECT DSM OPERATION Disconnect all the DSM connectors. Check for: corrosion push-out pins Connect all the DSM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new DSM. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-234516) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.

1. SCP circuits 914 (TN/OG) and 915 (PK/LB) open
2. DLC C251
3. PCM

Scheme 31

Scheme 32

1. C1 CHECK FOR AN OPEN BETWEEN THE DATA LINK CONNECTOR (DLC) C251 AND THE PCM C175 Key in OFF position. Disconnect: PCM C175. Measure the resistance between the PCM C175-15, circuit 915 (PK/LB), harness side and the DLC C251-10, circuit 915 (PK/LB), harness side. Measure the resistance between the PCM C175-16, circuit 914 (TN/OG), harness side and the DLC C251-2, circuit 914 (TN/OG), harness side. Are the resistances less than 5 ohms? Yes : GO to C2 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
2. C2 CHECK FOR CORRECT PCM OPERATION Disconnect all the PCM connectors. Check for: corrosion push-out pins Connect all the PCM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new PCM. REFER to «ELECTRONIC ENGINE CONTROLS»(ref-234534) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.

1. SCP circuits 914 (TN/OG) and 915 (PK/LB) open
2. DLC C251
3. instrument cluster

Scheme 33

Scheme 34

1. D1 CHECK FOR AN OPEN BETWEEN THE DATA LINK CONNECTOR (DLC) C251 AND THE INSTRUMENT CLUSTER C220a Key in OFF position. Disconnect: Instrument Cluster C220a. Measure the resistance between the instrument cluster C220a-10, circuit 914 (TN/OG), harness side and the DLC C251-2, circuit 914 (TN/OG), harness side. Measure the resistance between the instrument cluster C220a-9, circuit 915 (PK/LB), harness side and the DLC C251-10, circuit 915 (PK/LB), harness side. Are the resistances less than 5 ohms? Yes : GO to D2 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
2. D2 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION Disconnect all the instrument cluster connectors. Check for: corrosion push-out pins Connect all the instrument cluster connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new instrument cluster. REFER to «INSTRUMENT CLUSTER»(ref-234512) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.

1. ISO 9141 communication network circuit 70 (LB/WH) open
2. DLC C251
3. RCM

Scheme 35

1. E1 CHECK CIRCUIT 70 (LB/WH) BETWEEN THE DATA LINK CONNECTOR (DLC) C251 AND THE RCM C310a FOR AN OPEN Key in OFF position. Deactivate the air bag system. Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-234526) . Disconnect: RCM C310a. Measure the resistance between the RCM C310a-11, circuit 70 (LB/WH), harness side and the DLC C251-7, circuit 70 (LB/WH), harness side. Is the resistance less than 5 ohms? Yes : GO to E2 . No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. REACTIVATE the air bag system. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-234526) .
2. E2 CHECK FOR CORRECT RCM OPERATION Disconnect all the RCM connectors. Check for: corrosion push-out pins Connect all the RCM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new RCM. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-234526) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. REACTIVATE the air bag system. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-234526) . No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. REACTIVATE the air bag system. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-234526) .

1. SCP circuits 914 (TN/OG) and 915 (PK/LB) open
2. DLC C251
3. ABS module

Scheme 36

Scheme 37

1. F1 CHECK FOR AN OPEN BETWEEN THE DATA LINK CONNECTOR (DLC) C251 AND THE ABS MODULE C155 Key in OFF position. Disconnect: ABS Module C155. Measure the resistance between the ABS module C155-3, circuit 914 (TN/OG), harness side and the DLC C251-2, circuit 914 (TN/OG), harness side. Measure the resistance between the ABS module C155-18, circuit 915 (PK/LB), harness side and the DLC C251-10, circuit 915 (PK/LB), harness side. Are the resistances less than 5 ohms? Yes : GO to F2 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
2. F2 CHECK FOR CORRECT ABS MODULE OPERATION Disconnect all the ABS module connectors. Check for: corrosion push-out pins Connect all the ABS module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new ABS module. REFER to «ANTI-LOCK CONTROL»(ref-234510) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.

1. SCP circuits 914 (TN/OG) and 915 (PK/LB) open
2. DLC C251
3. DATC module

Scheme 38

Scheme 39

1. G1 CHECK FOR AN OPEN BETWEEN THE DATA LINK CONNECTOR (DLC) C251 AND THE DATC MODULE C228a Key in OFF position. Disconnect: DATC Module C228a. Measure the resistance between the DATC module C228a-13, circuit 914 (TN/OG), harness side and the DLC C251-2, circuit 914 (TN/OG), harness side. Measure the resistance between the DATC module C228a-12, circuit 915 (PK/LB), harness side and the DLC C251-10, circuit 915 (PK/LB), harness side. Are the resistances less than 5 ohms? Yes : GO to G2 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
2. G2 CHECK FOR CORRECT DATC MODULE OPERATION Disconnect all the DATC module connectors. Check for: corrosion push-out pins Connect all the DATC module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new DATC module. REFER to «CONTROL COMPONENTS»(ref-234543) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.

1. SCP circuits 914 (TN/OG) and 915 (PK/LB) open
2. DLC C251
3. speed control actuator

Scheme 40

Scheme 41

1. H1 CHECK FOR AN OPEN BETWEEN THE DATA LINK CONNECTOR (DLC) C251 AND THE SPEED CONTROL ACTUATOR C122 Key in OFF position. Disconnect: Speed Control Actuator C122. Measure the resistance between the speed control actuator C122-1, circuit 914 (TN/OG), harness side and the DLC C251-2, circuit 914 (TN/OG), harness side. Measure the resistance between the speed control actuator C122-2, circuit 915 (PK/LB), harness side and the DLC C251-10, circuit 915 (PK/LB), harness side. Are the resistances less than 5 ohms? Yes : GO to H2 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
2. H2 CHECK FOR CORRECT SPEED CONTROL ACTUATOR OPERATION Disconnect all the speed control actuator connectors. Check for: corrosion push-out pins Connect all the speed control actuator connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new speed control actuator. REFER to «SPEED CONTROL»(ref-234522) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.

1. ISO 9141 communication network circuit 70 (LB/WH) open
2. DLC C251
3. parking aid module

Scheme 42

Scheme 43

1. I1 CHECK CIRCUIT 70 (LB/WH) BETWEEN THE DATA LINK CONNECTOR (DLC) C251 AND THE PARKING AID MODULE FOR AN OPEN Key in OFF position. Disconnect: Parking Aid Module C4014 or C4226. For the 8 sensor parking aid module, measure the resistance between the parking aid module C4014-5, circuit 70 (LB/WH), harness side and the DLC C251-7, circuit 70 (LB/WH), harness side. For the 4 sensor parking aid module, measure the resistance between the parking aid module C4226-8, circuit 70 (LB/WH), harness side and the DLC C251-7, circuit 70 (LB/WH), harness side. Is the resistance less than 5 ohms? Yes : GO to I2 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
2. I2 CHECK FOR CORRECT PARKING AID MODULE OPERATION Disconnect all the parking aid module connectors. Check for: corrosion push-out pins Connect all the parking aid module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new parking aid module. REFER to «PARKING AID»(ref-234551) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.

1. UBP circuit 2077 (PK/LB) open
2. DLC C251
3. driver or passenger climate controlled seat module

Scheme 44

1. J1 CHECK THE UNIVERSAL ASYNCHRONOUS RECEIVER-TRANSMITTER (UART)-BASED PROTOCOL (UBP) NETWORK CIRCUIT BETWEEN THE CLIMATE CONTROLLED SEAT MODULE AND THE DATA LINK CONNECTOR (DLC) FOR AN OPEN Key in OFF position. Disconnect: Driver Climate Controlled Seat Module C3031a, or the Passenger Climate Controlled Seat Module C3036a. Measure the resistance between the driver climate controlled seat module C3031a-A, or passenger climate controlled seat module C3036a-A, circuit 2077 (PK/LB), harness side and the DLC C251-3, circuit 2077 (PK/LB), harness side. Are the resistances less than 5 ohms? Yes : GO to J2 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
2. J2 CHECK FOR CORRECT CLIMATE CONTROLLED SEAT MODULE OPERATION Disconnect all the driver or passenger climate controlled seat module connectors. Check for: corrosion push-out pins Connect all the driver or passenger climate controlled seat module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new driver or passenger climate controlled seat module. REFER to «SEATING»(ref-234523) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.

1. circuit 70 (LB/WH) open
2. DLC C251
3. LH PSD module or the RH PSD module

Scheme 45

1. K1 CHECK THE INTERNATIONAL STANDARDS ORGANIZATION (ISO) 9141 COMMUNICATION NETWORK CIRCUIT BETWEEN THE LH PSD MODULE OR THE RH PSD MODULE AND THE DATA LINK CONNECTOR (DLC) FOR AN OPEN Key in OFF position. Disconnect: LH PSD Module C3072a or RH PSD Module C3071a. Measure the resistance between the LH PSD module C3072a-10, or the RH PSD module C3071a-10, circuit 70 (LB/WH), harness side and the DLC C251-7, circuit 70 (LB/WH), harness side. Is the resistance less than 5 ohms? Yes : GO to K2 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
2. K2 CHECK FOR CORRECT LH PSD MODULE OR RH PSD MODULE OPERATION Disconnect all the LH PSD module, or RH PSD module connectors. Check for: corrosion push-out pins Connect all the LH PSD module, or RH PSD module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new LH PSD module, or RH PSD module. REFER to «BODY CLOSURES»(ref-234558) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.

1. ISO 9141 communication network circuit 70 (LB/WH) open
2. DLC C251
3. power liftgate module

Scheme 46

1. L1 CHECK INTERNATIONAL STANDARDS ORGANIZATION (ISO) 9141 COMMUNICATION NETWORK CIRCUIT 70 (LB/WH) BETWEEN THE POWER LIFTGATE MODULE C4174a AND THE DATA LINK CONNECTOR (DLC) C251 FOR AN OPEN Key in OFF position. Disconnect: Power Liftgate Module C4174a. Measure the resistance between the power liftgate module C4174a-1, circuit 70 (LB/WH), harness side and the DLC C251-7, circuit 70 (LB/WH), harness side. Is the resistance less than 5 ohms? Yes : GO to L2 . No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
2. L2 CHECK FOR CORRECT POWER LIFTGATE MODULE OPERATION Disconnect all the power liftgate module connectors. Check for: corrosion push-out pins Connect all the power liftgate module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new power liftgate module. REFER to «BODY CLOSURES»(ref-234558) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.

1. UBP circuit 2077 (PK/LB), shorted to voltage, ground, or open
2. driver climate control seat module
3. passenger climate control seat module
4. DSM
5. DATC module
6. DLC C251

Scheme 47

Scheme 48

Scheme 49

1. M1 CHECK THE VEHICLE FOR A PASSENGER CLIMATE CONTROLLED SEAT MODULE Check the vehicle for a passenger climate controlled seat module. Is the vehicle equipped with a passenger climate controlled seat module? Yes : GO to M2 . No : GO to M4 .
2. M2 CHECK THE UBP NETWORK CIRCUIT BETWEEN THE PASSENGER CLIMATE CONTROLLED SEAT MODULE AND THE DATA LINK CONNECTOR (DLC) FOR AN OPEN Key in OFF position. Disconnect: Passenger Climate Controlled Seat Module C3036a. Measure the resistance between the passenger climate controlled seat module C3036a-A, circuit 2077 (PK/LB), harness side and the DLC C251-3, circuit 2077 (PK/LB), harness side. Is the resistance less than 5 ohms? Yes : GO to M3 . No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
3. M3 CHECK THE UBP NETWORK WITH THE PASSENGER CLIMATE CONTROLLED SEAT MODULE DISCONNECTED Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test. Does the diagnostic tool indicate system passed? Yes : GO to M15 . No : GO to M4 .
4. M4 CHECK THE VEHICLE FOR A DRIVER CLIMATE CONTROLLED SEAT MODULE Check the vehicle for a driver climate controlled seat module. Is the vehicle equipped with a driver climate controlled seat module? Yes : GO to M5 . No : GO to M7 .
5. M5 CHECK THE UBP NETWORK CIRCUIT BETWEEN THE DRIVER CLIMATE CONTROLLED SEAT MODULE AND THE DLC FOR AN OPEN Key in OFF position. Connect: Passenger Climate Controlled Seat Module C3036a (if equipped). Disconnect: Driver Climate Controlled Seat Module C3031a. Measure the resistance between the driver climate controlled seat module C3031a-A, circuit 2077 (PK/LB), harness side and the DLC C251-3, circuit 2077 (PK/LB), harness side. Is the resistance less than 5 ohms? Yes : GO to M6 . No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
6. M6 CHECK THE UBP NETWORK WITH THE DRIVER CLIMATE CONTROLLED SEAT MODULE DISCONNECTED Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test. Does the diagnostic tool indicate system passed? Yes : GO to M15 . No : GO to M7 .
7. M7 CHECK THE VEHICLE FOR A DRIVER SEAT MODULE (DSM) Check the vehicle for a DSM. Is the vehicle equipped with a DSM? Yes : GO to M8 . No : GO to M10 .
8. M8 CHECK THE UBP NETWORK CIRCUIT BETWEEN THE DSM AND THE DLC FOR AN OPEN Key in OFF position. Connect: Driver Climate Controlled Seat Module C3031a (if equipped). Disconnect: DSM C341c. Measure the resistance between the DSM C341c-2, circuit 2077 (PK/LB), harness side and the DLC C251-3, circuit 2077 (PK/LB), harness side. Is the resistance less than 5 ohms? Yes : GO to M9 . No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
9. M9 CHECK THE UBP NETWORK WITH THE DSM DISCONNECTED Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test. Does the diagnostic tool indicate system passed? Yes : GO to M16 . No : GO to M10 .
10. M10 CHECK THE VEHICLE FOR A DUAL AUTOMATIC TEMPERATURE CONTROL (DATC) MODULE Check the vehicle for a DATC module. Is the vehicle equipped with a DATC module? Yes : GO to M11 . No : GO to M13 .
11. M11 CHECK THE UBP NETWORK CIRCUIT BETWEEN THE DATC MODULE AND THE DLC FOR AN OPEN Key in OFF position. Connect: DSM C341c (if equipped). Disconnect: DATC Module C228b. Measure the resistance between the DATC module C228b-12, circuit 2077 (PK/LB), harness side and the DLC C251-3, circuit 2077 (PK/LB), harness side. Is the resistance less than 5 ohms? Yes : GO to M12 . No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
12. M12 CHECK THE UBP NETWORK WITH THE DATC MODULE DISCONNECTED Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test. Does the diagnostic tool indicate system passed? Yes : GO to M17 . No : GO to M13 .
13. M13 CHECK THE UBP CIRCUIT 2077 (PK/LB) FOR A SHORT TO GROUND Key in OFF position. Disconnect: Driver Climate Controlled Seat Module C3031a (if equipped), Passenger Climate Controlled Seat Module C3036a (if equipped), DSM C341c (if equipped), and the DATC Module C228b (if equipped). Measure the resistance between the DLC C251-3, circuit 2077 (PK/LB), harness side and ground. Is the resistance greater than 10,000 ohms? Yes : GO to M14 . No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
14. M14 CHECK THE UBP CIRCUIT 2077 (PK/LB) FOR A SHORT TO VOLTAGE Key in ON position. Measure the voltage between the DLC C251-3, circuit 2077 (PK/LB), harness side and ground. Is any voltage indicated? Yes : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
15. M15 CHECK FOR CORRECT DRIVER OR PASSENGER CLIMATE CONTROLLED SEAT MODULE OPERATION Disconnect all the driver or passenger climate controlled seat module connectors. Check for: corrosion push-out pins Connect all the driver or passenger climate controlled seat module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new driver or passenger climate controlled seat module. REFER to «SEATING»(ref-234523) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
16. M16 CHECK FOR CORRECT DSM OPERATION Disconnect all the DSM connectors. Check for: corrosion push-out pins Connect all the DSM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new DSM. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-234516) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
17. M17 CHECK FOR CORRECT DATC MODULE OPERATION Disconnect all the DATC module connectors. Check for: corrosion push-out pins Connect all the DATC module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new DATC module. REFER to «CONTROL COMPONENTS»(ref-234543) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.

1. ISO 9141 communication network circuit 70 (LB/WH), shorted to ground or open
2. RCM
3. parking aid module (8 sensor)
4. parking aid module (4 sensor)
5. RH PSD module
6. LH PSD module
7. power liftgate module
8. DLC C251

Scheme 50

Scheme 51

1. N1 CHECK FOR AN OPEN CIRCUIT BETWEEN THE RESTRAINTS CONTROL MODULE (RCM) C310a AND THE DATA LINK CONNECTOR (DLC) C251 Key in OFF position. Deactivate the air bag system. Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-234526) . Disconnect: RCM C310a. Measure the resistance between the RCM C310a-11, circuit 70 (LB/WH), harness side and the DLC C251-7, circuit 70 (LB/WH), harness side. Is the resistance less than 5 ohms? Yes : GO to N2 . No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. REACTIVATE the air bag system. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-234526) .
2. N2 CHECK THE ISO 9141 COMMUNICATION NETWORK WITH THE RCM C310a DISCONNECTED Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test. Does the diagnostic tool indicate system passed? Yes : GO to N17 . No : GO to N3 .
3. N3 CHECK THE VEHICLE FOR A PARKING AID MODULE Key in OFF position. Connect: RCM C310a. Check the vehicle for a parking aid module. Is the vehicle equipped with parking aid module? Yes : GO to N4 . No : GO to N6 .
4. N4 CHECK CIRCUIT 70 (LB/WH) BETWEEN THE DLC C251 AND THE PARKING AID MODULE FOR AN OPEN Key in OFF position. Disconnect: Parking Aid Module C4014 or C4226. For the 8 sensor parking aid module, measure the resistance between the parking aid module C4014-5, circuit 70 (LB/WH), harness side and the DLC C251-7, circuit 70 (LB/WH), harness side. For the 4 sensor parking aid module, measure the resistance between the parking aid module C4226-8, circuit 70 (LB/WH), harness side and the DLC C251-7, circuit 70 (LB/WH), harness side. Are the resistances less than 5 ohms? Yes : GO to N5 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
5. N5 CHECK THE ISO 9141 COMMUNICATION NETWORK WITH THE PARKING AID MODULE DISCONNECTED Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test. Does the diagnostic tool indicate system passed? Yes : GO to N18 . No : GO to N6 .
6. N6 CHECK THE VEHICLE FOR A LH POWER SLIDING DOOR (PSD) MODULE Key in OFF position. Connect: Parking Aid Module Connectors (if equipped). Check the vehicle for a LH power sliding door (PSD) module. Is the vehicle equipped with a LH PSD module? Yes : GO to N7 . No : GO to N9 .
7. N7 CHECK THE ISO 9141 COMMUNICATION NETWORK CIRCUIT BETWEEN THE LH PSD MODULE AND THE DLC FOR AN OPEN Key in OFF position. Disconnect: LH PSD Module C3072a. Measure the resistance between the LH PSD module C3072a-10, circuit 70 (LB/WH), harness side and the DLC C251-7, circuit 70 (LB/WH), harness side. Is the resistance less than 5 ohms? Yes : GO to N8 . No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
8. N8 CHECK THE ISO 9141 COMMUNICATION NETWORK WITH THE LH PSD MODULE DISCONNECTED Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test. Does the diagnostic tool indicate system passed? Yes : GO to N19 . No : GO to N9 .
9. N9 CHECK THE VEHICLE FOR A RH PSD MODULE Key in OFF position. Connect: LH PSD Module C3072a (if equipped). Check the vehicle for a RH PSD module. Is the vehicle equipped with a RH PSD module? Yes : GO to N10 . No : GO to N12 .
10. N10 CHECK THE ISO 9141 COMMUNICATION NETWORK CIRCUIT BETWEEN THE RH PSD MODULE AND THE DLC FOR AN OPEN Key in OFF position. Disconnect: RH PSD Module C3071a. Measure the resistance between the RH PSD module C3071a-10, circuit 70 (LB/WH), harness side and the DLC C251-7, circuit 70 (LB/WH), harness side. Is the resistance less than 5 ohms? Yes : GO to N11 . No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
11. N11 CHECK THE ISO 9141 COMMUNICATION NETWORK WITH THE RH PSD MODULE DISCONNECTED Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test. Does the diagnostic tool indicate system passed? Yes : GO to N19 . No : GO to N12 .
12. N12 CHECK VEHICLE FOR A POWER LIFTGATE MODULE Key in OFF position. Connect: RH PSD Module C3071a, (if equipped). Check the vehicle for a power liftgate module. Is the vehicle equipped with a power liftgate module? Yes : GO to N13 . No : GO to N15 .
13. N13 CHECK THE ISO 9141 COMMUNICATION NETWORK CIRCUIT 70 (LB/WH) BETWEEN THE POWER LIFTGATE MODULE C4174a AND THE DLC C251 FOR AN OPEN Key in OFF position. Disconnect: Power Liftgate Module C4174a. Measure the resistance between the power liftgate module C4174a-1, circuit 70 (LB/WH), harness side and the DLC C251-7, circuit 70 (LB/WH), harness side. Is the resistance less than 5 ohms? Yes : GO to N14 . No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
14. N14 CHECK THE ISO 9141 COMMUNICATION NETWORK WITH THE POWER LIFTGATE MODULE DISCONNECTED Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test. Does the diagnostic tool indicate system passed? Yes : GO to N20 . No : GO to N15 .
15. N15 CHECK THE ISO 9141 COMMUNICATION NETWORK CIRCUIT FOR A SHORT TO GROUND Key in OFF position. Deactivate the air bag system. Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-234526) . Disconnect: RCM C310a, Parking Aid Module C4014 or C4226 (if equipped), RH PSD Module C3071a or LH PSD Module C3072a (if equipped), and the Power Liftgate Module C4174a (if equipped). Measure the resistance between the DLC C251-7, circuit 70 (LB/WH), harness side and ground. Is the resistance greater than 10,000 ohms? Yes : GO to N16 . No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. REACTIVATE the air bag system. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-234526) .
16. N16 CHECK THE ISO 9141 COMMUNICATION NETWORK CIRCUIT FOR A SHORT TO VOLTAGE Key in ON position. Measure the voltage between the DLC C251-7, circuit 70 (LB/WH), harness side and ground. Is any voltage indicated? Yes : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. REACTIVATE the air bag system. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-234526) . No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. REACTIVATE the air bag system. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-234526) .
17. N17 CHECK FOR CORRECT RCM OPERATION Disconnect all the RCM connectors. Check for: corrosion push-out pins Connect all the RCM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new RCM. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-234526) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. REACTIVATE the air bag system. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-234526) . No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. REACTIVATE the air bag system. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-234526) .
18. N18 CHECK FOR CORRECT PARKING AID MODULE OPERATION Disconnect all the parking aid module connectors. Check for: corrosion push-out pins Connect all the parking aid module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new parking aid module. REFER to «PARKING AID»(ref-234551) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. REACTIVATE the air bag system. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-234526) . No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. REACTIVATE the air bag system. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-234526) .
19. N19 CHECK FOR CORRECT RH PSD MODULE OR LH PSD MODULE OPERATION Disconnect all the RH PSD module or LH PSD module connectors. Check for: corrosion push-out pins Connect all the RH PSD module or LH PSD module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new RH PSD module or LH PSD Module. REFER to «BODY CLOSURES»(ref-234558) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. REACTIVATE the air bag system. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-234526) . No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. REACTIVATE the air bag system. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-234526) .
20. N20 CHECK FOR CORRECT POWER LIFTGATE MODULE OPERATION Disconnect all the power liftgate module connectors. Check for: corrosion push-out pins Connect all the power liftgate module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new power liftgate module. REFER to «BODY CLOSURES»(ref-234558) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. REACTIVATE the air bag system. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-234526) . No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. REACTIVATE the air bag system. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-234526) .

1. SCP circuits 914 (TN/OG) and 915 (PK/LB), shorted to voltage, ground or open
2. SJB
3. PCM
4. instrument cluster
5. ABS module
6. DATC module or the function selector switch
7. speed control actuator

Scheme 52

Scheme 53

1. O1 CHECK THE SCP NETWORK CIRCUITS BETWEEN THE POWERTRAIN CONTROL MODULE (PCM) C175 AND THE DATA LINK CONNECTOR (DLC) C251 FOR AN OPEN Key in OFF position. Disconnect: PCM C175. Measure the resistance between the PCM C175-15, circuit 915 (PK/LB), harness side and the DLC C251-10, circuit 915 (PK/LB), harness side. Measure the resistance between the PCM C175-16, circuit 914 (TN/OG), harness side and the DLC C251-2, circuit 914 (TN/OG), harness side. Are the resistances less than 5 ohms? Yes : GO to O2 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
2. O2 CHECK THE SCP NETWORK WITH THE PCM C175 DISCONNECTED Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test. Does the diagnostic tool indicate system passed? Yes : GO to O17 . No : GO to O3 .
3. O3 CHECK THE SCP NETWORK CIRCUITS BETWEEN THE ANTI-LOCK BRAKE SYSTEM (ABS) MODULE C155 AND THE DLC C251 FOR AN OPEN Key in OFF position. Connect: PCM C175. Disconnect: ABS Module C155. Measure the resistance between the ABS module C155-3, circuit 914 (TN/OG), harness side and the DLC C251-2, circuit 914 (TN/OG), harness side. Measure the resistance between the ABS module C155-18, circuit 915 (PK/LB), harness side and the DLC C251-10, circuit 915 (PK/LB), harness side. Are the resistances less than 5 ohms? Yes : GO to O4 . No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
4. O4 CHECK THE SCP NETWORK WITH THE ABS MODULE C155 DISCONNECTED Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test. Does the diagnostic tool indicate system passed? Yes : GO to O19 . No : GO to O5 .
5. O5 CHECK THE SCP NETWORK CIRCUITS BETWEEN THE DUAL AUTOMATIC TEMPERATURE CONTROL (DATC) C228a OR MANUAL FUNCTION SELECTOR SWITCH C294a AND THE DLC C251 FOR AN OPEN Key in OFF position. Connect: ABS Module C155. Disconnect: DATC Module C228a or the Manual Function Selector Switch C294a. Measure the resistance between the DATC module C228a-13, or the manual function selector switch C294a-13, circuit 914 (TN/OG), harness side and the DLC C251-2, circuit 914 (TN/OG), harness side. Measure the resistance between the DATC module C228a-12, or the manual function selector switch C294a-12, circuit 915 (PK/LB), harness side and the DLC C251-10, circuit 915 (PK/LB), harness side. Are the resistances less than 5 ohms? Yes : GO to O6 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
6. O6 CHECK THE SCP NETWORK WITH THE DATC OR THE MANUAL FUNCTION SELECTOR SWITCH DISCONNECTED Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test. Does the diagnostic tool indicate system passed? Yes : GO to O20 . No : GO to O7 .
7. O7 CHECK THE VEHICLE FOR A SPEED CONTROL ACTUATOR Check the vehicle for a speed control actuator. Does the vehicle have a speed control actuator? Yes : GO to O8 . No : GO to O10 .
8. O8 CHECK THE SCP NETWORK CIRCUITS BETWEEN THE SPEED CONTROL ACTUATOR C122 AND THE DLC C251 FOR AN OPEN Key in OFF position. Connect: DATC Module C228a or the Manual Function Selector Switch C294a. Disconnect: Speed Control Actuator C122. Measure the resistance between the speed control actuator C122-1, circuit 914 (TN/OG), harness side and the DLC C251-2, circuit 914 (TN/OG), harness side. Measure the resistance between the speed control actuator C122-2, circuit 915 (PK/LB), harness side and the DLC C251-10, circuit 915 (PK/LB), harness side. Are the resistances less than 5 ohms? Yes : GO to O9 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
9. O9 CHECK THE SCP NETWORK WITH THE SPEED CONTROL ACTUATOR C122 DISCONNECTED Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test. Does the diagnostic tool indicate system passed? Yes : GO to O21 . No : GO to O10 .
10. O10 CHECK THE SCP NETWORK CIRCUITS BETWEEN THE SMART JUNCTION BOX (SJB) C2280b AND THE DLC C251 FOR AN OPEN Key in OFF position. Disconnect: SJB C2280b. Measure the resistance between the SJB C2280b-50, circuit 914 (TN/OG), harness side and the DLC C251-2, circuit 914 (TN/OG), harness side. Measure the resistance between the SJB C2280b-51, circuit 915 (PK/LB), harness side and the DLC C251-10, circuit 915 (PK/LB), harness side. Are the resistances less than 5 ohms? Yes : GO to O11 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
11. O11 CHECK THE SCP NETWORK WITH THE SJB C2280b DISCONNECTED Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test. Does the diagnostic tool indicate system passed? Yes : GO to O16 . No : GO to O12 .
12. O12 CHECK THE SCP NETWORK CIRCUITS BETWEEN THE INSTRUMENT CLUSTER C220a AND THE DLC C251 FOR AN OPEN Key in OFF position. Connect: SJB C2280b. Disconnect: Instrument Cluster C220a. Measure the resistance between the instrument cluster C220a-10, circuit 914 (TN/OG), harness side and the DLC C251-2, circuit 914 (TN/OG), harness side. Measure the resistance between the instrument cluster C220a-9, circuit 915 (PK/LB), harness side and the DLC C251-10, circuit 915 (PK/LB), harness side. Are the resistances less than 5 ohms? Yes : GO to O13 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
13. O13 CHECK THE SCP NETWORK WITH THE INSTRUMENT CLUSTER C220a DISCONNECTED Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test. Does the diagnostic tool indicate system passed? Yes : GO to O18 . No : GO to O14 .
14. O14 CHECK THE SCP CIRCUITS FOR A SHORT TO GROUND Key in OFF position. Disconnect: SJB C2280b, PCM C175, Instrument Cluster C220a, ABS Module C155, the DATC Module C228a or Manual Selector Switch C294a (if equipped), and the Speed Control Actuator C122 (if equipped). Measure the resistance between the DLC C251-10, circuit 915 (PK/LB), harness side and ground; and between the DLC C251-2, circuit 914 (TN/OG), harness side and ground Are the resistances greater than 10,000 ohms? Yes : GO to O15 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
15. O15 CHECK THE SCP CIRCUITS FOR A SHORT TO POWER Key in ON position. Measure the voltage between the DLC C251-10, circuit 915 (PK/LB), harness side and ground; and between the DLC C251-2, circuit 914 (TN/OG), harness side and ground Is any voltage indicated? Yes : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
16. O16 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion push-out pins Connect all the SJB connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new SJB. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-234516) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
17. O17 CHECK FOR CORRECT PCM OPERATION Disconnect all the PCM connectors. Check for: corrosion push-out pins Connect all the PCM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new PCM. REFER to «ELECTRONIC ENGINE CONTROLS»(ref-234534) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
18. O18 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION Disconnect all the instrument cluster connectors. Check for: corrosion push-out pins Connect all the instrument cluster connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new instrument cluster. REFER to «INSTRUMENT CLUSTER»(ref-234512) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
19. O19 CHECK FOR CORRECT ABS MODULE OPERATION Disconnect all the ABS module connectors. Check for: corrosion push-out pins Connect all the ABS module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new ABS module. REFER to «ANTI-LOCK CONTROL»(ref-234510) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
20. O20 CHECK FOR CORRECT DATC MODULE OPERATION Disconnect all the DATC module connectors. Check for: corrosion push-out pins Connect all the DATC module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new DATC module. REFER to «CONTROL COMPONENTS»(ref-234543) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
21. O21 CHECK FOR CORRECT SPEED CONTROL ACTUATOR OPERATION Disconnect all the speed control actuator connectors. Check for: corrosion push-out pins Connect all the speed control actuator connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes : INSTALL a new speed control actuator. REFER to «SPEED CONTROL»(ref-234522) . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.

1. DLC C251
2. diagnostic tool
3. power (overload protected), circuit 40 (LB/WH) short to ground or open
4. ground circuit 1203 (BK/LB) open circuit
5. ground circuit 1205 (BK) open circuit

Scheme 54

Scheme 55

1. P1 CHECK THE DIAGNOSTIC TOOL CONNECTOR Inspect the diagnostic tool pins for damage. Are the pins OK? Yes : GO to P2 . No : REPAIR the diagnostic tool connector. CARRY OUT the data link diagnostics test.
2. P2 CHECK THE DATA LINK CONNECTOR (DLC) C251 FOR DAMAGE Key in OFF position. Inspect the DLC C251 pins for damage. Are the pins OK? Yes : GO to P3 . No : REPAIR the DLC C251. CARRY OUT the data link diagnostics test.
3. P3 CHECK THE VOLTAGE TO THE DIAGNOSTIC TOOL CIRCUIT 40 (LB/WH) Measure the voltage between the DLC C251-16, circuit 40 (LB/WH), harness side and ground. Is the voltage greater than 10 volts? Yes : GO to P4 . No : REPAIR the circuit. CARRY OUT the data link diagnostics test.
4. P4 CHECK THE DLC GROUND CIRCUITS 1205 (BK) AND CIRCUIT 1203 (BK/LB) Measure the resistance between the DLC C251-4, circuit 1205 (BK), harness side and ground; and between the DLC C251-5, circuit 1203 (BK/LB), harness side and ground. Are the resistances less than 5 ohms? Yes : REPAIR the diagnostic tool. CARRY OUT the data link diagnostics test. No : REPAIR the circuit in question. CARRY OUT the data link diagnostics test.