Module Communications Network: Diagnosis

Inspection and Verification

Verify the customer concern.
Visually inspect for obvious signs of electrical damage. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step. Visual Inspection Chart VISUAL INSPECTION CHART Electrical Battery Junction Box (BJB) fuse(s): 7 (30A) (no communication with the audio DSP module) 12 (20A) (no communication with ABS module) 23 (7.5A) (no communication with PCM) 32 (30A) (no communication with DSM ) 34 (30A) (no communication with LTM ) 37 (10A) (no communication with PCM, 3.5L) 47 20A) (no communication with PCM) Smart Junction Box (SJB) fuse(s): 5 (10A) (no communication with SJB ) 11 (10A) (no communication with 4X4 control module) 13 (5A) (no communication with DSM ) 14 (10A) (no communication with APIM , FDIM , GPSM , LTM , RETM ) 15 (10A) (no communication with HVAC module) 16 (15A) (no communication with FCIM ) 20 (15A) (no communication with scan tool) 26 (10A) (no communication with IC ) 29 (5A) (no communication with IC ) 32 (10A) (no communication with RCM ) 34 (5A) (no communication with ABS module, PSCM ) 35 (10A) (no communication with 4X4 control module, PAM , SASM ) 37 (10A) (no communication with PCM, 3.5L GTDI ) 39 (20A) (no communication with ACM ) 46 (7.5A) (no communication with OCSM ) Data Link Connector (DLC) Wiring harness Wiring, terminals or connectors
Connect the scan tool to the DLC . NOTE: Make sure to use the latest scan tool software release. NOTE: The Vehicle Communication Module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM . If the Integrated Diagnostic System (IDS) does not communicate with the VCM : Check the VCM connection to the vehicle. Check the scan tool connection to the VCM . GO to «PINPOINT TEST Y»(ref-372772-S41528755982010093000000) , to diagnose No Power To The Scan Tool.
Establish a scan tool session. NOTE: The scan tool first attempts to communicate with the PCM, after establishing communication with the PCM, the scan tool then attempts to communicate with all other modules on the vehicle. If an IDS session cannot be established with the vehicle, ( IDS may state "No communication can be established with the PCM"): Choose "NO" when the scan tool prompts whether or not to retry communication. Enter either a PCM part number, tear tag or calibration number to identify the vehicle and start a session (the PCM part number and 4-character tear tag are printed on the PCM label). GO to «PINPOINT TEST A»(ref-372772-S08012902832010093000000) , The PCM Does Not Respond To The Scan Tool.
Carry out the network test. If the network test passes, retrieve and record the continuous memory DTCs and proceed to Step 6. If the network test fails, GO to «SYMPTOM CHART»(ref-372772-S13013128482010093000000) to diagnose the failed communication network. If a module fails to communicate during the network test, GO to «SYMPTOM CHART»(ref-372772-S13013128482010093000000) .
Retrieve and review the DTCs. If the DTCs retrieved are related to the concern, go to DTC Charts. Follow the non-network DTC diagnostics (B-codes, C-codes, P-codes) prior to the network DTC diagnostics (U-codes). For all other DTCs, refer to the Diagnostic Trouble Code (DTC) Chart in «MULTIFUNCTION ELECTRONIC MODULES»(ref-372773) . If no DTCs related to the concern are retrieved, GO to «SYMPTOM CHART»(ref-372772-S13013128482010093000000) .

DTC Charts

Note. Network DTCs (U-codes) are often a result of intermittent concerns such as damaged wiring or low battery voltage occurrences. Additionally, vehicle repair procedures such as module reprogramming often set network DTCs. Replacing a module to resolve a network DTC is unlikely to resolve the concern. To prevent repeat network DTC concerns, inspect all network wiring, especially connectors. Test the vehicle battery condition, Refer to BATTERY, MOUNTING AND CABLES .

Communication Network DTC Chart

Note. Some of these modules utilize a 5-character DTC followed by a 2-character failure-type code. The failure-type code provides information about specific fault conditions such as opens, or shorts to ground. Continuous memory DTCs have an additional 2-character DTC status code suffix to assist in determining DTC history.

DTC	Description	Source	Action
U0028:08	Vehicle Communication Bus A: Bus Signal/Message Failure	Restraints Control Module (RCM)	DTC U0028:08 is set when the RCM receives invalid network data from another module with a faulted input. RETRIEVE and REPAIR all non-network DTCs in the other modules on the network. Refer to MULTIFUNCTION ELECTRONIC MODULES for a list of all DTCs.
U0028:88	Vehicle Communication Bus A: Bus Off	RCM	DTC U0028:88 is set when the RCM receives invalid network data from another module with a faulted input. RETRIEVE and REPAIR all non-network DTCs in the other modules on the network. Refer to MULTIFUNCTION ELECTRONIC MODULES for a list of all DTCs.
U0073	Control Module Communication Bus A Off	ABS module	The module could not communicate on the network at a point in time. The fault is currently not present since the module is currently communicating with the scan tool reporting this DTC. CLEAR the DTC. REPEAT the network test with the scan tool.
U0401	Invalid Data Received from ECM /PCM A	4X4 control module	RETRIEVE and FOLLOW non-network DTCs from the PCM.
U0415	Invalid Data Received from Anti-Lock Brake System (ABS) Control Module	4X4 control module	RETRIEVE and FOLLOW non-network DTCs from the ABS module.
U0422:00	Invalid Data Received From Body Control Module: No Sub Type Information	Accessory Protocol Interface Module (APIM)	RETRIEVE and FOLLOW non-network DTCs from the Smart Junction Box (SJB).
U0423:00	Invalid Data Received From Instrument Panel Cluster ( IPC ) Control Module: No Sub Type Information	APIM	RETRIEVE and FOLLOW non-network DTCs from the Instrument Cluster (IC).
U0485:00	Invalid Data Received From Radio: No Sub Type Information	APIM	RETRIEVE and FOLLOW non-network DTCs from the Audio Control Module (ACM).
U2023	Fault Received From External Node	IC	DTC U2023 is set when the IC receives invalid network data from another module with a faulted input. RETRIEVE and REPAIR all non-network DTCs in the other modules on the network. Refer to MULTIFUNCTION ELECTRONIC MODULES for a list of all DTCs.
U2023	Fault Received From External Node	ABS module	DTC U2023 is set when the RCM receives invalid network data from another module with a faulted input. RETRIEVE and REPAIR all non-network DTCs in the other modules on the network. Refer to MULTIFUNCTION ELECTRONIC MODULES for a list of all DTCs.
U3000:88	Control Module: Bus Off	APIM	The module could not communicate on the network at a point in time. The fault is currently not present since the module is currently communicating with the scan tool reporting this DTC. CLEAR the DTC. REPEAT the network test with the scan tool.
All other DTCs			Refer to MULTIFUNCTION ELECTRONIC MODULES .

COMMUNICATION NETWORK DTC CHART

Symptom Chart

Condition	Possible Sources	Action
The vehicle does not start with the scan tool connected to the Data Link Connector (DLC) and/or multiple malfunction indicators are only on when the scan tool is connected to the DLC .	Wiring, terminals or connectors Scan tool	GO to PINPOINT TEST Y .
The PCM does not respond to the scan tool	Wiring, terminals or connectors PCM	REFER to the INTRODUCTION - GASOLINE MODELS , pinpoint test QA before proceeding to PINPOINT TEST A . If pinpoint test QA has been completed, GO to PINPOINT TEST A .
The ABS module does not respond to the scan tool	Fuse Wiring, terminals or connectors ABS module	GO to PINPOINT TEST B .
The Instrument Cluster (IC) does not respond to the scan tool	Fuse Wiring, terminals or connectors IC	GO to PINPOINT TEST C .
The Restraints Control Module (RCM) does not respond to the scan tool	Fuse Wiring, terminals or connectors Case ground open RCM	GO to PINPOINT TEST D .
The Occupant Classification System Module (OCSM) does not respond to the scan tool	Fuse Wiring, terminals or connectors OCSM	GO to PINPOINT TEST E .
The 4X4 control module does not respond to the scan tool	Fuse Wiring, terminals or connectors 4X4 control module	GO to PINPOINT TEST F .
The Power Steering Control Module (PSCM) does not respond to the scan tool	Fuse Wiring, terminals or connectors PSCM	GO to PINPOINT TEST G .
The Steering Angle Sensor Module (SASM) does not respond to the scan tool	Fuse Wiring, terminals or connectors SASM	GO to PINPOINT TEST H .
The Parking Aid Module (PAM) does not respond to the scan tool	Fuse Wiring, terminals or connectors PAM	GO to PINPOINT TEST I .
The HVAC module does not respond to the scan tool	Fuse Wiring, terminals or connectors HVAC module	GO to PINPOINT TEST J .
The Audio Control Module (ACM) does not respond to the scan tool	Fuse Wiring, terminals or connectors ACM	GO to PINPOINT TEST K .
The audio Digital Signal Processing (DSP) module does not respond to the scan tool	Fuse Wiring, terminals or connectors Audio DSP module	GO to PINPOINT TEST L .
The Front Controls Interface Module (FCIM) does not respond to the scan tool	Fuse Wiring, terminals or connectors FCIM	GO to PINPOINT TEST M .
The Front Display Interface Module (FDIM) does not respond to the scan tool	Fuse Wiring, terminals or connectors FDIM	GO to PINPOINT TEST N .
The Driver Seat Module (DSM) does not respond to the scan tool	Fuse Wiring, terminals or connectors DSM	GO to PINPOINT TEST O .
The Rear Entertainment Module (RETM) does not respond to the scan tool	Fuse Wiring, terminals or connectors RETM	GO to PINPOINT TEST P .
The Liftgate/Trunk Module (LTM) does not respond to the scan tool	Fuse Wiring, terminals or connectors LTM	GO to PINPOINT TEST Q .
The Smart Junction Box (SJB) does not respond to the scan tool	Fuse Wiring, terminals or connectors SJB	GO to PINPOINT TEST R .
The Global Positioning System Module (GPSM) does not respond to the scan tool	Fuse Wiring, terminals or connectors GPSM	GO to PINPOINT TEST S .
The Accessory Protocol Interface Module (APIM) does not respond to the scan tool	Fuse Wiring, terminals or connectors APIM	GO to PINPOINT TEST T .
Intermittent no High Speed Controller Area Network (HS-CAN) communication, communication can be intermittently established	Wiring, terminals or connectors	GO to PINPOINT TEST U .
No High Speed Controller Area Network (HS-CAN) communication, all modules are not responding	Wiring, terminals or connectors 4X4 control module (if equipped) ABS module APIM IC OCSM PAM PCM PSCM RCM SASM	GO to PINPOINT TEST V .
Intermittent no Medium Speed Controller Area Network (MS-CAN) communication, communication can be intermittently established	Wiring, terminals or connectors	GO to PINPOINT TEST W .
No Medium Speed Controller Area Network (MS-CAN) communication, all modules are not responding	Wiring, terminals or connectors ACM APIM Audio DSP module (if equipped) DSM (if equipped) FCIM FDIM GPSM HVAC module (if equipped) IC LTM RETM SJB	GO to PINPOINT TEST X .
No power to the scan tool	Fuse Wiring, terminals or connectors Scan tool	GO to PINPOINT TEST Y .

SYMPTOM CHART

Pinpoint Test A: The PCM Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 2

Scheme 2: PINPOINT TEST A: THE PCM DOES NOT RESPOND TO THE SCAN TOOL

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A1 VERIFY WHETHER OTHER HS-CAN MODULES PASS THE NETWORK TEST Enter the following diagnostic mode on the scan tool: Network Test. In the LH pane of the IDS network test display screen, verify whether any HS-CAN modules passed the network test. Is the text "pass" or a DTC listed next to any of the following modules (if equipped): 4X4 control module, ABS module, Accessory Protocol Interface Module (APIM), Instrument Cluster (IC), Occupant Classification System Module (OCSM), Parking Aid Module (PAM), PCM, Power Steering Control Module (PSCM), Restraints Control Module (RCM) or Steering Angle Sensor Module (SASM)? Yes: If "pass" or a DTC was listed next to the PCM, a network fault is not currently present. GO to «PINPOINT TEST U»(ref-372772-S03707563622010093000000) to diagnose an intermittent HS-CAN fault condition. If "pass" or a DTC was listed next to one or more modules other than the PCM, GO to A2 . No: No modules are currently communicating on the HS-CAN . GO to «PINPOINT TEST V»(ref-372772-S02005518212010093000000) to diagnose no HS-CAN communication.
A2 VERIFY THE POWERTRAIN CONTROL/EMISSIONS DIAGNOSIS (PC/ED) MANUAL PINPOINT TEST QA HAS BEEN CARRIED OUT Verify that pinpoint test QA has been carried out. Has pinpoint test QA been carried out? Yes: GO to A3 . No: REFER to the «INTRODUCTION - GASOLINE MODELS»(ref-355661) , pinpoint test QA to diagnose no communication with the PCM.
A3 CHECK THE HS-CAN TERMINATION RESISTANCE Ignition OFF. Disconnect: Negative Battery Cable. Disconnect the scan tool from the Data Link Connector (DLC). Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance between 54 and 66 ohms? Yes: GO to A6 . No: For 3.5L engine, GO to A4 . For 3.5L GTDI engine, GO to A5 .
A4 CHECK THE HS-CAN CIRCUITS BETWEEN THE PCM AND THE DLC FOR AN OPEN - 3.5L Disconnect: PCM C175b. Measure the resistance between the PCM C175b-2, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the PCM C175b-3, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to A6 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
A5 CHECK THE HS-CAN CIRCUITS BETWEEN THE PCM AND THE DLC FOR AN OPEN - 3.5L GTDI Disconnect: PCM C1381b. Measure the resistance between the PCM C1381b-59, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the PCM C1381b-58, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to A6 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
A6 CHECK FOR CORRECT PCM OPERATION Disconnect all the PCM connectors. Check for: corrosion damaged pins pushed-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-372808) . CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test B: The ABS Module Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 7

Scheme 7: PINPOINT TEST B: THE ABS MODULE DOES NOT RESPOND TO THE SCAN TOOL

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Scheme 10

B1 CHECK THE VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: ABS Module C135. Ignition ON. Measure the voltage between the ABS module C135-25, circuit SBB12 (GN/RD), harness side and ground; and between the ABS module C135-35, circuit CBP34 (VT/BN), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to B2 . No: VERIFY the Battery Junction Box (BJB) fuse 12 (20A) or the Smart Junction Box (SJB) fuse 34 (5A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool.
B2 CHECK THE GROUND CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: Negative Battery Cable. Measure the resistance between the ABS module C135-38, circuit GD120 (BK/GN), harness side and ground. Is the resistance less than 5 ohms? Yes: CONNECT the negative battery cable. GO to B3 . No: REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
B3 CHECK THE HS-CAN CIRCUITS BETWEEN THE DLC AND THE ABS MODULE FOR AN OPEN Measure the resistance between the ABS module C135-26, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the ABS module C135-14, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to B4 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
B4 CHECK FOR CORRECT ABS MODULE OPERATION Disconnect the ABS module connector. Check for: corrosion damaged pins pushed-out pins Connect the ABS module connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes: INSTALL a new ABS module. Refer to «VEHICLE DYNAMIC SYSTEMS»(ref-372786) . CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test C: The Instrument Cluster (IC) Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

PINPOINT TEST C: THE IC DOES NOT RESPOND TO THE SCAN TOOL

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 11

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C1 CHECK THE HS-CAN TERMINATION RESISTANCE Ignition OFF. Disconnect: Negative Battery Cable. Disconnect the scan tool cable from the Data Link Connector (DLC). Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit 1828 (PK/LG), harness side. Is the resistance between 54 and 66 ohms? Yes: GO to C3 . No: GO to C2 .
C2 CHECK THE HS-CAN CIRCUITS BETWEEN THE IC AND THE DLC FOR AN OPEN Disconnect: IC C220. Measure the resistance between the IC C220-25, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the IC C220-26, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to C7 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
C3 CHECK THE MS-CAN TERMINATION RESISTANCE Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance between 54 and 66 ohms? Yes: GO to C5 . No: GO to C4 .
C4 CHECK THE MS-CAN CIRCUITS BETWEEN THE IC AND THE DLC FOR AN OPEN Measure the resistance between the IC C220-12, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the IC C220-13, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to C7 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
C5 CHECK THE IC GROUND CIRCUIT FOR AN OPEN Measure the resistance between the IC C220-4, circuit GD114 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? Yes: CONNECT the negative battery cable. GO to C6 . No: REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
C6 CHECK THE IC VOLTAGE SUPPLY CIRCUITS FOR AN OPEN Ignition ON. Disconnect: IC C220. Measure the voltage between the IC C220-21, circuit SBP26 (YE/RD), harness side and ground; and between the IC C220-20, circuit CBP29 (WH/VT), harness side and ground. Are the voltages greater than 10 volts? Yes: GO to C7 . No: VERIFY Smart Junction Box (SJB) fuse 26 (10A) or fuse 29 (5A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to IDENTIFY the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool.
C7 CHECK FOR CORRECT IC OPERATION Disconnect the IC connector. Check for: corrosion damaged pins pushed-out pins Connect the IC connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes: INSTALL a new IC . Refer to «INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES»(ref-372777) . CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test D: The Restraints Control Module (RCM) Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

PINPOINT TEST D: THE RCM DOES NOT RESPOND TO THE SCAN TOOL

WARNING

Never disassemble or tamper with safety belt buckle/retractor pretensioners or adaptive load limiting retractors or probe the electrical connectors. Failure to follow this instruction may result in the accidental deployment of the safety belt pretensioners or adaptive load limiting retractors which increases the risk of serious personal injury or death.

WARNING

Never probe the electrical connectors on air bag, Safety Canopy® or side air curtain modules. Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

Note. The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.

Note. Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 18

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D1 CHECK THE RCM CONNECTION Ignition OFF. Depower the SRS . Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-372796) . Disconnect: RCM C310a. Disconnect: RCM C310b. Inspect the RCM connectors for damaged, pushed out or corroded pins. Are the RCM pins OK? Yes: GO to D2 . No: REPAIR the RCM connector pins as necessary. REPOWER the SRS . Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-372796) . CLEAR the DTCs. REPEAT the network test with the scan tool.
D2 CHECK THE RCM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Repower the SRS . Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-372796) . Ignition ON. Measure the voltage between the RCM C310a-13, circuit CBP32 (GN/VT), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to D3 . No: VERIFY the Smart Junction Box (SJB) fuse 32 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-372796) . CLEAR the DTCs. REPEAT the network test with the scan tool.
D3 CHECK THE RCM CASE GROUND Ignition OFF. Disconnect: Negative Battery Cable. Measure the resistance between the RCM case and a good chassis ground. Is the resistance less than 5 ohms? Yes: GO to D4 . No: REPAIR the RCM case ground as necessary. Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-372796) . CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
D4 CHECK THE HS-CAN CIRCUITS BETWEEN THE RCM AND THE DLC FOR AN OPEN Measure the resistance between the RCM C310b-10, circuit VDB04 (WH/BU), harness side and the Data Link Connector (DLC) C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the RCM C310b-9, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to D5 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
D5 CHECK FOR CORRECT RCM OPERATION Disconnect all the RCM connectors. Check for: corrosion damaged pins pushed-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-372796) . CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test E: The Occupant Classification System Module (OCSM) Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

PINPOINT TEST E: THE OCSM DOES NOT RESPOND TO THE SCAN TOOL

WARNING

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.

Note. Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 21

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E1 CHECK THE OCSM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: OCSM C3159. Depower the SRS . Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-372796) . Ignition ON. Measure the voltage between the OCSM C3159-1, circuit CBX02 (BN/RD), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to E2 . No: VERIFY the Smart Junction Box (SJB) fuse 46 (7.5A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. REPOWER the SRS . Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-372796) . CLEAR the DTCs. REPEAT the network test with the scan tool.
E2 CHECK THE OCSM GROUND CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: Negative Battery Cable. Measure the resistance between the OCSM C3159-14, circuit GD901 (BK), harness side and ground. Is the resistance less than 5 ohms? Yes: GO to E3 . No: REPAIR the circuit. REPOWER the SRS . Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-372796) . CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
E3 CHECK THE HS-CAN CIRCUITS BETWEEN THE OCSM AND THE DLC FOR AN OPEN Measure the resistance between the OCSM C3159-18, circuit VDB04 (WH/BU), harness side and the Data Link Connector (DLC) C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the OCSM C3159-9, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to E4 . No: REPAIR the circuit in question. REPOWER the SRS . Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-372796) . CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
E4 CHECK FOR CORRECT OCSM OPERATION Disconnect the OCSM connector. Check for: corrosion damaged pins pushed-out pins Connect the OCSM connector and make sure it seats correctly. Verify the concern is still present. Is the concern still present? Yes: INSTALL a new OCSM . Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-372796) . REPOWER the SRS . CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. REPOWER the SRS . Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-372796) .

Pinpoint Test F: The 4X4 Control Module Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 25

Scheme 25: PINPOINT TEST F: THE 4X4 CONTROL MODULE DOES NOT RESPOND TO THE SCAN TOOL

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Scheme 27

Scheme 28

F1 CHECK THE 4X4 CONTROL MODULE VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: 4X4 Control Module C281. Ignition ON. Measure the voltage between the 4X4 control module C281-4, circuit CBP35 (YE/GY), harness side and ground; and between the 4X4 control module C281-5, circuit SBP11 (BU/RD), harness side and ground. Are the voltages greater than 10 volts? Yes: GO to F2 . No: VERIFY the Smart Junction Box (SJB) fuses 35 (10A) and 11 (10A) are OK. If OK, REPAIR the circuit in question. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
F2 CHECK THE 4X4 CONTROL MODULE GROUND CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: Negative Battery Cable. Measure the resistance between the 4X4 control module C281-15, circuit GD145 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? Yes: GO to F3 . No: REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
F3 CHECK THE HS-CAN CIRCUITS BETWEEN THE 4X4 CONTROL MODULE AND THE DLC FOR AN OPEN Measure the resistance between the 4X4 control module C281-3, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the 4X4 control module C281-11, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to F4 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
F4 CHECK FOR CORRECT 4X4 CONTROL MODULE OPERATION Disconnect the 4X4 control module connector. Check for: corrosion damaged pins pushed-out pins Connect the 4X4 control module connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes: INSTALL a new 4X4 control module. Refer to «FOUR WHEEL DRIVE (4WD) SYSTEMS»(ref-372817) . CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test G: The Power Steering Control Module (PSCM) Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

PINPOINT TEST G: THE PSCM DOES NOT RESPOND TO THE SCAN TOOL

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 29

Scheme 29: PINPOINT TEST G: THE PSCM DOES NOT RESPOND TO THE SCAN TOOL

Scheme 30

Scheme 31

Scheme 32

G1 CHECK THE PSCM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Disconnect: PSCM C1463a. Ignition ON. Measure the voltage between the PSCM C1463a-3, circuit CBP34 (VT/BN), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to G2 . No: VERIFY the Smart Junction Box (SJB) fuse 34 (5A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool.
G2 CHECK THE PSCM GROUND CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: PSCM C1463b. Disconnect: Negative Battery Cable. Measure the resistance between the PSCM C1463b-2, circuit GD108 (BK/VT), harness side and ground. Is the resistance less than 5 ohms? Yes: GO to G3 . No: REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
G3 CHECK THE HS-CAN CIRCUITS BETWEEN THE PSCM AND THE DLC FOR AN OPEN Measure the resistance between the PSCM C1463a-1, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the PSCM C1463a-2, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to G4 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
G4 CHECK FOR CORRECT PSCM OPERATION Disconnect all the PSCM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the PSCM 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 steering gear. Refer to «POWER STEERING»(ref-372769) . CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test H: The Steering Angle Sensor Module (SASM) Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

PINPOINT TEST H: THE SASM DOES NOT RESPOND TO THE SCAN TOOL

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 33

Scheme 33: PINPOINT TEST H: THE SASM DOES NOT RESPOND TO THE SCAN TOOL

Scheme 34

Scheme 35

Scheme 36

H1 CHECK THE SASM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: SASM C2412. Ignition ON. Measure the voltage between the SASM C2412-1, circuit CBP35 (YE/GY), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to H2 . No: VERIFY the Smart Junction Box (SJB) fuse 35 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool.
H2 CHECK THE SASM GROUND CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: Negative Battery Cable. Measure the resistance between the SASM C2412-4, circuit GD114 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? Yes: GO to H3 . No: REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
H3 CHECK THE HS-CAN CIRCUITS BETWEEN THE SASM AND THE DLC FOR AN OPEN Measure the resistance between the SASM C2412-3, circuit VDB04 (WH/BU), harness side and the Data Link Connector (DLC) C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the SASM C2412-2, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to H4 . No: REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
H4 CHECK FOR CORRECT SASM OPERATION Disconnect the SASM connector. Check for: corrosion damaged pins pushed-out pins Connect the SASM connector and make sure it seats correctly. Verify the concern is still present. Is the concern still present? Yes: INSTALL a new SASM . REFER to Steering Wheel Rotation Sensor in «VEHICLE DYNAMIC SYSTEMS»(ref-372786) . CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test I: The Parking Aid Module (PAM) Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

PINPOINT TEST I: THE PAM DOES NOT RESPOND TO THE SCAN TOOL

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 37

Scheme 37: PINPOINT TEST I: THE PAM DOES NOT RESPOND TO THE SCAN TOOL

Scheme 38

Scheme 39

Scheme 40

I1 CHECK THE PAM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: PAM C3267. Ignition ON. Measure the voltage between the PAM C3267-1, circuit CBP35 (YE/GY), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to I2 . No: VERIFY the Smart Junction Box (SJB) fuse 35 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. TEST the system for normal operation.
I2 CHECK THE PAM GROUND CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: Negative Battery Cable. Measure the resistance between the PAM C3267-4, circuit GD145 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? Yes: GO to I3 . No: REPAIR the circuit. CONNECT the negative battery cable. TEST the system for normal operation.
I3 CHECK THE HS-CAN CIRCUITS BETWEEN THE PAM AND THE DLC FOR AN OPEN Measure the resistance between the PAM C3267-3, circuit VDB04 (WH/BU), harness side and the Data Link Connector (DLC) C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the PAM C3267-11, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to I4 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
I4 CHECK FOR CORRECT PAM OPERATION Disconnect the PAM connector. Check for: corrosion damaged pins pushed-out pins Connect the PAM connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes: INSTALL a new PAM . Refer to «PARKING AID»(ref-372829) . CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test J: The HVAC Module Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 41

Scheme 41: PINPOINT TEST J: THE HVAC MODULE DOES NOT RESPOND TO THE SCAN TOOL

Scheme 42

Scheme 43

Scheme 44

J1 CHECK THE HVAC MODULE VOLTAGE SUPPLY CIRCUITS FOR AN OPEN Ignition OFF. Disconnect: HVAC Module C228a. Ignition ON. Measure the voltage between the HVAC module C228a-1, circuit SBP15 (WH/RD), harness side and ground. Are the voltages greater than 10 volts? Yes: GO to J2 . No: VERIFY the Smart Junction Box (SJB) fuse 15 (10A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool.
J2 CHECK THE HVAC MODULE GROUND CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: Negative Battery Cable. Measure the resistance between the HVAC module C228a-17, circuit GD116 (BK/VT), harness side and ground. Is the resistance less than 5 ohms? Yes: CONNECT the negative battery cable. GO to J3 . No: REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
J3 CHECK THE MS-CAN CIRCUITS BETWEEN THE HVAC MODULE AND THE DLC FOR AN OPEN Measure the resistance between the HVAC module C228a-15, circuit VDB06 (GY/OG), harness side and the Data Link Connector (DLC) C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the HVAC module C228a-14, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to J4 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
J4 CHECK FOR CORRECT HVAC MODULE OPERATION Disconnect all the HVAC module connectors. Check for: corrosion damaged pins pushed-out pins Connect all the HVAC 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 HVAC module. Refer to «CLIMATE CONTROL»(ref-372816) . CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test K: The Audio Control Module (ACM) Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

PINPOINT TEST K: THE ACM DOES NOT RESPOND TO THE SCAN TOOL

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 45

Scheme 45: PINPOINT TEST K: THE ACM DOES NOT RESPOND TO THE SCAN TOOL

Scheme 46

Scheme 47

Scheme 48

K1 CHECK THE ACM VOLTAGE SUPPLY CIRCUITS FOR AN OPEN Ignition OFF. Disconnect: ACM C240a. Ignition ON. Measure the voltage between the ACM C240a-1, circuit SBP39 (WH/RD), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to K2 . No: VERIFY the Smart Junction Box (SJB) fuse 39 (20A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool.
K2 CHECK THE ACM GROUND CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: Negative Battery Cable. Measure the resistance between the ACM C240a-13, circuit GD114 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? Yes: GO to K3 . No: REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
K3 CHECK THE MS-CAN CIRCUITS BETWEEN THE ACM AND THE DLC FOR AN OPEN Disconnect: ACM C240c. Measure the resistance between the ACM C240c-15, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the ACM C240c-16, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to K4 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
K4 CHECK FOR CORRECT ACM OPERATION Disconnect all the ACM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the ACM 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 ACM . Refer to «INFORMATION AND ENTERTAINMENT SYSTEMS»(ref-372799) . CLEAR the DTCs. REPEAT the network test with the scan tool. TEST the system for normal operation. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test L: The Audio Digital Signal Processing (DSP) Module Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

PINPOINT TEST L: THE AUDIO DSP MODULE DOES NOT RESPOND TO THE SCAN TOOL

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 49

Scheme 49: PINPOINT TEST L: THE AUDIO DSP MODULE DOES NOT RESPOND TO THE SCAN TOOL

Scheme 50

Scheme 51

Scheme 52

L1 CHECK THE AUDIO DSP MODULE VOLTAGE SUPPLY CIRCUITS FOR AN OPEN Ignition OFF. Disconnect: Audio DSP Module C4208c. Ignition ON. Measure the voltage between the audio DSP module, harness side and ground as follows: VOLTAGE REFERENCE CHART Connector-Pin Circuit C4208c-5 SBB07 (WH/RD) C4208c-6 SBB07 (WH/RD) C4208c-7 SBB07 (WH/RD) C4208c-8 SBB07 (WH/RD) Are the voltages greater than 10 volts? Yes: GO to L2 . No: VERIFY the Battery Junction Box (BJB) fuse 7 (30A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool.
L2 CHECK THE AUDIO DSP MODULE GROUND CIRCUITS FOR AN OPEN Ignition OFF. Disconnect: Negative Battery Cable. Measure the resistance between the audio DSP module, harness side and ground as follows: RESISTANCE REFERENCE CHART Connector-Pin Circuit C4208c-13 GD148 (BK/YE) C4208c-14 GD148 (BK/YE) C4208c-15 GD148 (BK/YE) C4208c-16 GD148 (BK/YE) Are the resistances less than 5 ohms? Yes: GO to L3 . No: REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
L3 CHECK THE MS-CAN CIRCUITS BETWEEN THE AUDIO DSP MODULE AND THE DLC FOR AN OPEN Disconnect: Audio DSP Module C4208a. Measure the resistance between the audio DSP module C4208a-1, circuit VDB06 (GY/OG), harness side and the Data Link Connector (DLC) C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the audio DSP module C4208a-11, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to L4 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
L4 CHECK FOR CORRECT AUDIO DSP MODULE OPERATION Disconnect all the audio DSP module connectors. Check for: corrosion damaged pins pushed-out pins Connect all the audio DSP 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 audio DSP module. Refer to «INFORMATION AND ENTERTAINMENT SYSTEMS»(ref-372799) . CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test M: The Front Controls Interface Module (FCIM) Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

PINPOINT TEST M: THE FCIM DOES NOT RESPOND TO THE SCAN TOOL

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 53

Scheme 53: PINPOINT TEST M: THE FCIM DOES NOT RESPOND TO THE SCAN TOOL

Scheme 54

Scheme 55

Scheme 56

M1 CHECK THE FCIM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: FCIM C2402. Ignition ON. Measure the voltage between the FCIM C2402-1, circuit SBP16 (VT/RD), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to M2 . No: VERIFY the Smart Junction Box (SJB) fuse 16 (15A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool.
M2 CHECK THE FCIM GROUND CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: Negative Battery Cable. Measure the resistance between the FCIM C2402-4, circuit GD114 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? Yes: GO to M3 . No: REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
M3 CHECK THE MS-CAN CIRCUITS BETWEEN THE FCIM AND THE DLC FOR AN OPEN Measure the resistance between the FCIM C2402-2, circuit VDB06 (GY/OG), harness side and the Data Link Connector (DLC) C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the FCIM C2402-3, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to M4 . No: REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
M4 CHECK FOR CORRECT FCIM OPERATION Disconnect the FCIM connector. Check for: corrosion damaged pins pushed-out pins Connect the FCIM connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes: INSTALL a new FCIM . Refer to «INFORMATION AND ENTERTAINMENT SYSTEMS»(ref-372799) . CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test N: The Front Display Interface Module (FDIM) Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

PINPOINT TEST N: THE FDIM DOES NOT RESPOND TO THE SCAN TOOL

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 57

Scheme 57: PINPOINT TEST N: THE FDIM DOES NOT RESPOND TO THE SCAN TOOL

Scheme 58

Scheme 59

Scheme 60

N1 CHECK THE FDIM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: FDIM C2123. Ignition ON. Measure the voltage between the FDIM C2123-12, circuit SBP14 (BN/RD), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to N2 . No: VERIFY the Smart Junction Box (SJB) fuse 14 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool.
N2 CHECK THE FDIM GROUND CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: Negative Battery Cable. Measure the resistance between the FDIM C2123-8, circuit GD114 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? Yes: GO to N3 . No: REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
N3 CHECK THE MS-CAN CIRCUITS BETWEEN THE FDIM AND THE DLC FOR AN OPEN Measure the resistance between the FDIM C2123-4, circuit VDB06 (GY/OG), harness side and the Data Link Connector (DLC) C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the FDIM C2123-5, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to N4 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
N4 CHECK FOR CORRECT FDIM OPERATION Disconnect the FDIM connector. Check for: corrosion damaged pins pushed-out pins Connect the FDIM connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes: INSTALL a new FDIM . Refer to «INFORMATION AND ENTERTAINMENT SYSTEMS»(ref-372799) . CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test O: The Driver Seat Module (DSM) Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

PINPOINT TEST O: THE DSM DOES NOT RESPOND TO THE SCAN TOOL

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 61

Scheme 61: PINPOINT TEST O: THE DSM DOES NOT RESPOND TO THE SCAN TOOL

Scheme 62

Scheme 63

Scheme 64

Scheme 65

Scheme 66

O1 CHECK THE DSM VOLTAGE SUPPLY CIRCUITS FOR AN OPEN Ignition OFF. Disconnect: DSM C341a. Disconnect: DSM C341b. Measure the voltage between the DSM C341a-1, circuit CBX05 (VT/RD), harness side and ground. Measure the voltage between the DSM C341b-1, circuit CBX03 (BU/RD), harness side and ground. Are the voltages greater than 10 volts? Yes: GO to O2 . No: VERIFY the Battery Junction Box (BJB) fuse 32 (30A) or the Smart Junction Box (SJB) fuse 13 (5A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool.
O2 CHECK THE DSM GROUND CIRCUITS FOR AN OPEN Ignition OFF. Disconnect: Negative Battery Cable. Measure the resistance between the DSM C341a-2, circuit GD906 (BK/GY), harness side and ground. Measure the resistance between the DSM C341b-24, circuit GD905 (BK/GN), harness side and ground. Are the resistances less than 5 ohms? Yes: GO to O3 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
O3 CHECK THE MS-CAN CIRCUITS BETWEEN THE DSM AND THE DLC FOR AN OPEN Disconnect: DSM C341d. Measure the resistance between the DSM C341d-10, circuit VDB06 (GY/OG), harness side and the Data Link Connector (DLC) C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the DSM C341d-9, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to O4 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
O4 CHECK FOR CORRECT DSM OPERATION Disconnect all the DSM connectors. Check for: corrosion damaged pins pushed-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-372773) . REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test P: The Rear Entertainment Module (RETM) Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

PINPOINT TEST P: THE RETM DOES NOT RESPOND TO THE SCAN TOOL

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 67

Scheme 67: PINPOINT TEST P: THE RETM DOES NOT RESPOND TO THE SCAN TOOL

Scheme 68

Scheme 69

Scheme 70

P1 CHECK THE RETM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: RETM C2949a. Ignition ON. Measure the voltage between the RETM C2949a-13, circuit SBP14 (BN/RD), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to P2 . No: VERIFY the Smart Junction Box (SJB) fuse 14 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
P2 CHECK THE RETM GROUND CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: Negative Battery Cable. Measure the resistance between the RETM C2949a-1, circuit GD114 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? Yes: CONNECT the negative battery cable. GO to P3 . No: REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
P3 CHECK THE MS-CAN CIRCUITS BETWEEN THE RETM AND THE DLC FOR AN OPEN Disconnect: RETM C2949b. Measure the resistance between the RETM C2949b-14, circuit VDB06 (GY/OG), harness side and the Data Link Connector (DLC) C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the RETM C2949b-15, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to P4 . No: REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
P4 CHECK FOR CORRECT RETM OPERATION Disconnect the RETM connector. Check for: corrosion damaged pins pushed-out pins Connect the RETM connector and make sure it seats correctly. Verify the concern is still present. Is the concern still present? Yes: INSTALL a new RETM . Refer to «INFORMATION AND ENTERTAINMENT SYSTEMS»(ref-372799) . CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test Q: The Liftgate/Trunk Module (LTM) Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

PINPOINT TEST Q: THE LTM DOES NOT RESPOND TO THE SCAN TOOL

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 71

Scheme 71: PINPOINT TEST Q: THE LTM DOES NOT RESPOND TO THE SCAN TOOL

Scheme 72

Scheme 73

Scheme 74

Q1 CHECK THE LTM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: LTM C4174b. Ignition ON. Measure the voltage between the LTM C4174b-4, circuit SBB34 (YE/RD), harness side and ground; and between the LTM C4174b-9, circuit SBP14 (BN/RD), harness side and ground. Are the voltages greater than 10 volts? Yes: GO to Q2 . No: VERIFY the Battery Junction Box (BJB) fuse 34 (30A) and the Smart Junction Box (SJB) fuse 14 (10A) are OK. If OK, REPAIR the circuit in question. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool.
Q2 CHECK THE LTM GROUND CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: Negative Battery Cable. Measure the resistance between the LTM C4174b-1, circuit GD149 (BK/GY), harness side and ground. Is the resistance less than 5 ohms? Yes: GO to Q3 . No: REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
Q3 CHECK THE MS-CAN CIRCUITS BETWEEN THE LTM AND THE DLC FOR AN OPEN Measure the resistance between the LTM C4174a-11, circuit VDB06 (GY/OG), harness side and the Data Link Connector (DLC) C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the LTM C4174a-10, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to Q4 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
Q4 CHECK FOR CORRECT LTM OPERATION Disconnect the LTM connector. Check for: corrosion damaged pins pushed-out pins Connect the LTM connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes: INSTALL a new LTM . Refer to «BODY CLOSURES»(ref-372826) . CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test R: The Smart Junction Box (SJB) Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

PINPOINT TEST R: THE SJB DOES NOT RESPOND TO THE SCAN TOOL

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 75

Scheme 75: PINPOINT TEST R: THE SJB DOES NOT RESPOND TO THE SCAN TOOL

Scheme 76

Scheme 77

Scheme 78

R1 CHECK THE SJB VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Ignition ON. NOTE: Measurements are taken with the fuses installed. Measure the voltage between the SJB fuse 5 (10A) and ground. Is the voltage greater than 10 volts? Yes: GO to R2 . No: VERIFY the SJB fuse 5 (10A) is OK. If OK, GO to R4 . If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short.
R2 CHECK THE SJB GROUND CIRCUITS FOR AN OPEN Ignition OFF. Disconnect: Negative Battery Cable. Disconnect: SJB C2280d. Measure the resistance between the SJB C2280d-8, circuit GD133 (BK), harness side and ground; and between the SJB C2280d-12, circuit GD133 (BK), harness side and ground. Are the resistances less than 5 ohms? Yes: GO to R3 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
R3 CHECK THE MS-CAN CIRCUITS BETWEEN THE SJB AND THE DLC FOR AN OPEN Disconnect: SJB C2280b. Measure the resistance between the SJB C2280b-37, circuit VDB06 (GY/OG), harness side and the Data Link Connector (DLC) C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the SJB C2280b-38, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to R4 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
R4 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion damaged pins pushed-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-372773) . CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test S: The Global Positioning System Module (GPSM) Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

PINPOINT TEST S: THE GPSM DOES NOT RESPOND TO THE SCAN TOOL

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 79

Scheme 79: PINPOINT TEST S: THE GPSM DOES NOT RESPOND TO THE SCAN TOOL

Scheme 80

Scheme 81

Scheme 82

S1 CHECK THE GPSM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: GPSM C2300. Ignition ON. Measure the voltage between the GPSM C2300-1, circuit SBP14 (BN/RD), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to S2 . No: VERIFY the Smart Junction Box (SJB) fuse 14 (10A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool.
S2 CHECK THE GPSM GROUND CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: Negative Battery Cable. Measure the resistance between the GPSM C2300-6, circuit GD114 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? Yes: GO to S3 . No: REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
S3 CHECK THE MS-CAN CIRCUITS BETWEEN THE GPSM AND THE DLC FOR AN OPEN Measure the resistance between the GPSM C2300-2, circuit VDB06 (GY/OG), harness side and the Data Link Connector (DLC) C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the GPSM C2300-3, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to S4 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
S4 CHECK FOR CORRECT GPSM OPERATION Disconnect the GPSM connector. Check for: corrosion damaged pins pushed-out pins Connect the GPSM connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes: INSTALL a new GPSM . Refer to «INFORMATION AND ENTERTAINMENT SYSTEMS»(ref-372799) . CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test T: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

PINPOINT TEST T: THE APIM DOES NOT RESPOND TO THE SCAN TOOL

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 83

Scheme 83: PINPOINT TEST T: THE APIM DOES NOT RESPOND TO THE SCAN TOOL

Scheme 84

Scheme 85

Scheme 86

Scheme 87

Scheme 88

T1 CHECK THE APIM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Disconnect: APIM C3342. Ignition ON. Measure the voltage between the APIM C3342-1, circuit SBP14 (BN/RD), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to T2 . No: VERIFY the Smart Junction Box (SJB) fuse 14 (10A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool.
T2 CHECK THE APIM GROUND CIRCUITS FOR AN OPEN Ignition OFF. Disconnect: Negative Battery Cable. Measure the resistance between the APIM C3342-37, circuit GD114 (BK/BU), harness side and ground; and between the APIM C3342-38, circuit GD114 (BK/BU), harness side and ground. Are the resistances less than 5 ohms? Yes: GO to T3 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
T3 CHECK THE HS-CAN CIRCUITS BETWEEN THE APIM AND THE DLC FOR AN OPEN Measure the resistance between the APIM C3342-53, circuit VDB04 (WH/BU), harness side and the Data Link Connector (DLC) C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the APIM C3342-54, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? Yes: GO to T4 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
T4 CHECK THE MS-CAN CIRCUITS BETWEEN THE APIM AND THE DLC FOR AN OPEN Measure the resistance between the APIM C3342-16, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the APIM C3342-17, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to T5 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
T5 CHECK FOR CORRECT APIM OPERATION Disconnect all the APIM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the APIM 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 APIM . Refer to «INFORMATION AND ENTERTAINMENT SYSTEMS»(ref-372799) . CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

PINPOINT TEST U: INTERMITTENT NO HS-CAN COMMUNICATION, COMMUNICATION CAN BE INTERMITTENTLY ESTABLISHED

Note. Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.

Note. Various network DTCs set while disabling modules in this test procedure, which need to be cleared after the diagnostic procedure is completed.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 89

Scheme 89: PINPOINT TEST U: INTERMITTENT NO HS-CAN COMMUNICATION, COMMUNICATION CAN BE INTERMITTENTLY ESTABLISH

Scheme 90

Scheme 91

U1 CHECK THE DLC PINS FOR DAMAGE Ignition OFF. Disconnect the scan tool cable from the Data Link Connector (DLC). Inspect DLC pins 6 and 14 for damage. Are DLC pins 6 and 14 OK? Yes: GO to U2 . No: REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
U2 CHECK THE HS-CAN TERMINATION RESISTANCE Ignition OFF. Disconnect: Negative Battery Cable. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance between 54 and 66 ohms? Yes: GO to U3 . No: GO to «PINPOINT TEST V»(ref-372772-S02005518212010093000000) .
U3 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: GO to U4 . No: GO to «PINPOINT TEST V»(ref-372772-S02005518212010093000000) .
U4 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE Connect: Negative Battery Cable. Ignition ON. Measure the voltage between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Is the voltage greater than 6 volts? Yes: REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool. No: GO to U5 .
U5 CHECK FOR RESTORED COMMUNICATION WITH THE PCM DISABLED Disconnect: Battery Junction Box (BJB) Fuses 23 (7.5A) and 47 (20A). Enter the following diagnostic mode on the scan tool: Network Test. Repeat the network test. Do all other HS-CAN modules pass the network test? Yes: INSTALL the removed fuses. GO to «PINPOINT TEST A»(ref-372772-S08012902832010093000000) . No: INSTALL the removed fuses. GO to U6 .
U6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ABS MODULE AND PSCM DISABLED Disconnect: SJB Fuse 34 (5A). Disconnect: BJB Fuse 12 (20A). Enter the following diagnostic mode on the scan tool: Network Test. Repeat the network test. Do all other HS-CAN modules pass the network test? Yes: INSTALL the removed fuse. If the vehicle is equipped with a Power Steering Control Module (PSCM), GO to U7 . If the vehicle is not equipped with a PSCM , GO to «PINPOINT TEST B»(ref-372772-S31205042662010093000000) . No: INSTALL the removed fuse. GO to U8 .
U7 CHECK FOR RESTORED COMMUNICATION WITH THE ABS MODULE DISCONNECTED Disconnect: ABS Module C135. Enter the following diagnostic mode on the scan tool: Network Test. Repeat the network test. Do all other HS-CAN modules pass the network test? Yes: CONNECT the ABS module. GO to «PINPOINT TEST B»(ref-372772-S31205042662010093000000) . No: CONNECT the ABS module. GO to «PINPOINT TEST G»(ref-372772-S14943137032010093000000) .
U8 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE RCM DISABLED Disconnect: SJB Fuse 32 (10A). Enter the following diagnostic mode on the scan tool: Network Test. Repeat the network test. Do all other HS-CAN modules pass the network test? Yes: INSTALL the removed fuse. GO to «PINPOINT TEST D»(ref-372772-S01595192832010093000000) . No: INSTALL the removed fuse. GO to U9 .
U9 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE OCSM DISABLED Disconnect: SJB Fuse 46 (7.5A). Enter the following diagnostic mode on the scan tool: Network Test. Repeat the network test. Do all other HS-CAN modules pass the network test? Yes: INSTALL the removed fuse. GO to «PINPOINT TEST E»(ref-372772-S04386209962010093000000) . No: INSTALL the removed fuse. If the vehicle is equipped with an APIM , GO to U10 . If the vehicle is not equipped with an APIM , GO to U11 .
U10 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM DISABLED Disconnect: SJB Fuse 14 (10A). Enter the following diagnostic mode on the scan tool: Network Test. Repeat the network test. Do all other HS-CAN modules pass the network test? Yes: INSTALL the removed fuse. GO to «PINPOINT TEST T»(ref-372772-S14679216772010093000000) . No: INSTALL the removed fuse. GO to U11 .
U11 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE 4X4 CONTROL MODULE, PAM AND SASM DISABLED Disconnect: SJB Fuses 11 (10A) and 35 (10A). Enter the following diagnostic mode on the scan tool: Network Test. Repeat the network test. Do all other HS-CAN modules pass the network test? Yes: INSTALL the removed fuses. GO to U12 . No: INSTALL the removed fuses. GO to U13 .
U12 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE 4X4 CONTROL MODULE, PAM AND SASM DISCONNECTED Disconnect: 4X4 Control Module C281 (If Equipped). Repeat the network test. If all other HS-CAN modules pass the network test, skip to end of test step. Otherwise, continue. Disconnect: Parking Aid Module (PAM) C3267 (If Equipped). Repeat the network test. If all other HS-CAN modules pass the network test, skip to end of test step. Otherwise, continue. Disconnect: Steering Angle Sensor Module (SASM) C2412 (If Equipped). Enter the following diagnostic mode on the scan tool: Network Test. Repeat the network test. Do all other HS-CAN modules pass the network test? Yes: CONNECT all modules. For 4X4 control module, GO to «PINPOINT TEST F»(ref-372772-S05376544092010093000000) . For PAM , GO to «PINPOINT TEST I»(ref-372772-S00053593172010093000000) . For SASM , GO to «PINPOINT TEST H»(ref-372772-S33246371232010093000000) . No: An intermittent fault is not present. GO to «PINPOINT TEST V»(ref-372772-S02005518212010093000000) .
U13 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IC DISABLED Disconnect: SJB Fuses 26 (10A) and 29 (5A). Enter the following diagnostic mode on the scan tool: Network Test. Repeat the network test. Do all other HS-CAN modules pass the network test? Yes: INSTALL the removed fuses. GO to «PINPOINT TEST C»(ref-372772-S42705113432010093000000) . No: INSTALL the removed fuse. GO to «PINPOINT TEST V»(ref-372772-S02005518212010093000000) .

Pinpoint Test V: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

PINPOINT TEST V: NO HS-CAN COMMUNICATION, ALL MODULES ARE NOT RESPONDING

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

V1 CHECK THE DLC PINS FOR DAMAGE Ignition OFF. Disconnect the scan tool cable from the Data Link Connector (DLC). Inspect DLC pins 6 and 14 for damage. Are DLC pins 6 and 14 OK? Yes: GO to V2 . No: REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
V2 CHECK THE HS-CAN TERMINATION RESISTANCE Ignition OFF. Disconnect: Negative Battery Cable. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance between 54 and 66 ohms? Yes: GO to V3 . No: GO to V5 .
V3 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: GO to V4 . No: GO to V21 .
V4 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE Connect: Negative Battery Cable. Ignition ON. Measure the voltage between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the voltages greater than 6 volts? Yes: REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The Controller Area Network (CAN) has tested within specifications. GO to «PINPOINT TEST U»(ref-372772-S03707563622010093000000) to diagnose an intermittent HS-CAN fault.
V5 CHECK THE HS-CAN TERMINATION RESISTOR Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance between 108 and 132 ohms? Yes: GO to V6 . No: GO to V9 .
V6 CHECK THE HS-CAN TERMINATION RESISTOR WITH THE PCM DISCONNECTED Disconnect: PCM C175b or C1381b. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance between 108 and 132 ohms? Yes: GO to V7 . No: GO to V8 .
V7 CHECK THE HS-CAN CIRCUITS BETWEEN THE PCM AND THE DLC FOR AN OPEN For 3.5L, measure the resistance between the PCM C175b-2, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. For 3.5L, measure the resistance between the PCM C175b-3, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. For 3.5L GTDI , measure the resistance between the PCM C1381b-59, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. For 3.5L GTDI , measure the resistance between the PCM C1381b-58, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to V31 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
V8 CHECK THE HS-CAN CIRCUITS BETWEEN THE IC AND THE DLC FOR AN OPEN Disconnect: IC C220. Measure the resistance between the IC C220-25, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the IC C220-26, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to V39 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
V9 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? Yes: GO to V11 . No: GO to V10 .
V10 CHECK THE HS-CAN CIRCUITS BETWEEN THE PCM AND THE DLC FOR AN OPEN For 3.5L, measure the resistance between the PCM C175b-2, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. For 3.5L, measure the resistance between the PCM C175b-3, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. For 3.5L GTDI , measure the resistance between the PCM C1381b-59, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. For 3.5L GTDI , measure the resistance between the PCM C1381b-58, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? Yes: The CAN has tested within specifications. CONNECT the negative battery cable. VERIFY the scan tool operation on a substitute vehicle, and REPEAT the network test on the suspect vehicle. No: A capacitor internal to a module may still be draining causing irregular resistance readings. WAIT 5 minutes. REPEAT the pinpoint test.
V11 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE PCM DISCONNECTED Disconnect: PCM C175b or C1381b. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? Yes: If the vehicle is equipped with a Parking Aid Module (PAM), GO to V12 . If the vehicle is not equipped with a PAM , GO to V13 . No: CONNECT the negative battery cable. GO to V31 .
V12 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE PAM DISCONNECTED Disconnect: PAM C3267. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? Yes: GO to V14 . No: CONNECT the negative battery cable. GO to V32 .
V13 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE ABS MODULE DISCONNECTED Disconnect: ABS Module C135. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? Yes: If the vehicle is equipped with a 4X4 control module, GO to V14 . If the vehicle is not equipped with a 4X4 control module, GO to V15 . No: CONNECT the negative battery cable. GO to V33 .
V14 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE 4X4 CONTROL MODULE DISCONNECTED Disconnect: 4X4 Control Module C281. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? Yes: GO to V15 . No: CONNECT the negative battery cable. GO to V34 .
V15 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE RCM DISCONNECTED Disconnect: RCM C310b. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? Yes: If the vehicle is equipped with a Steering Angle Sensor Module (SASM), GO to V16 . If the vehicle is not equipped with a SASM , GO to V17 . No: CONNECT the negative battery cable. GO to V35 .
V16 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE SASM DISCONNECTED Disconnect: SASM C2412. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? Yes: GO to V17 . No: CONNECT the negative battery cable. GO to V36 .
V17 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE OCSM DISCONNECTED Disconnect: OCSM C3159. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? Yes: If the vehicle is equipped with a Power Steering Control Module (PSCM), GO to V18 . If the vehicle is not equipped with a PSCM, GO to V19. No: CONNECT the negative battery cable. GO to V37 .
V18 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE PSCM DISCONNECTED Disconnect: PSCM C1463a. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? Yes: GO to V19 . No: CONNECT the negative battery cable. GO to V38 .
V19 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE IC DISCONNECTED Disconnect: IC C220. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? Yes: If the vehicle is equipped with an APIM , GO to V20 . If the vehicle is not equipped with a APIM , REPAIR the circuits. CONNECT all modules. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool. No: CONNECT the negative battery cable. GO to V39 .
V20 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE APIM DISCONNECTED Disconnect: APIM C3342. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? Yes: REPAIR the circuits. CONNECT all modules. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool. No: CONNECT the negative battery cable. GO to V40 .
V21 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE PCM DISCONNECTED Disconnect: PCM C175b Or C1381b. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: CONNECT the negative battery cable. GO to V31 . No: If the vehicle is equipped with a Parking Aid Module (PAM), GO to V22 . If the vehicle is not equipped with a PAM , GO to V23 .
V22 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE PAM DISCONNECTED Disconnect: PAM C3267. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: CONNECT the negative battery cable. GO to V32 . No: GO to V24 .
V23 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE ABS MODULE DISCONNECTED Disconnect: ABS Module C135. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: CONNECT the negative battery cable. GO to V33 . No: If the vehicle is equipped with a 4X4 control module, GO to V24 . If the vehicle is not equipped with a 4X4 control module, GO to V25 .
V24 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE 4X4 CONTROL MODULE DISCONNECTED Disconnect: 4X4 Control Module C281. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: CONNECT the negative battery cable. GO to V34 . No: GO to V25 .
V25 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE RCM DISCONNECTED Disconnect: RCM C310b. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: CONNECT the negative battery cable. GO to V35 . No: If the vehicle is equipped with a Steering Angle Sensor Module (SASM), GO to V26 . If the vehicle is not equipped with a SASM , GO to V27 .
V26 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE SASM DISCONNECTED Disconnect: SASM C2412. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: CONNECT the negative battery cable. GO to V36 . No: GO to V27 .
V27 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE OCSM DISCONNECTED Disconnect: OCSM C3159. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? Yes: CONNECT the negative battery cable. GO to V37 . No: If the vehicle is equipped with a Power Steering Control Module (PSCM), GO to V28 . If the vehicle is not equipped with a PSCM , GO to V29 .
V28 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE PSCM DISCONNECTED Disconnect: PSCM C1463a. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: CONNECT the negative battery cable. GO to V38 . No: GO to V29 .
V29 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE IC DISCONNECTED Disconnect: IC C220. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: CONNECT the negative battery cable. GO to V39 . No: If the vehicle is equipped with an APIM , GO to V30 . If the vehicle is not equipped with a APIM , REPAIR the circuits. CONNECT all modules. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
V30 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE APIM DISCONNECTED Disconnect: APIM C3342. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: CONNECT the negative battery cable. GO to V40 . No: REPAIR the circuits. CONNECT all modules. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
V31 CHECK FOR CORRECT PCM OPERATION Disconnect all the PCM connectors. Check for: corrosion damaged pins pushed-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-372808) . CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
V32 CHECK FOR CORRECT PAM OPERATION Disconnect the PAM connector. Check for: corrosion damaged pins pushed-out pins Connect the PAM connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes: INSTALL a new PAM . Refer to «PARKING AID»(ref-372829) . CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules.
V33 CHECK FOR CORRECT ABS MODULE OPERATION Disconnect the ABS module connector. Check for: corrosion damaged pins pushed-out pins Connect the ABS module connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes: INSTALL a new ABS module. Refer to «VEHICLE DYNAMIC SYSTEMS»(ref-372786) . CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules.
V34 CHECK FOR CORRECT 4X4 CONTROL MODULE OPERATION Disconnect the 4X4 control module connector. Check for: corrosion damaged pins pushed-out pins Connect the 4X4 control module connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes: INSTALL a new 4X4 control module. Refer to «FOUR WHEEL DRIVE (4WD) SYSTEMS»(ref-372817) . CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules.
V35 CHECK FOR CORRECT RCM OPERATION Disconnect all the RCM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the RCM connectors and make sure they seat correctly. Verify the concern is still present. Is the concern still present? Yes: INSTALL a new RCM . Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-372796) . CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules.
V36 CHECK FOR CORRECT SASM OPERATION Disconnect all the SASM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the SASM connectors and make sure they seat correctly. Verify the concern is still present. Is the concern still present? Yes: INSTALL a new SASM . REFER to Steering Wheel Rotation Sensor in «VEHICLE DYNAMIC SYSTEMS»(ref-372786) . CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules.
V37 CHECK FOR CORRECT OCSM OPERATION Disconnect the OCSM connector. Check for: corrosion damaged pins pushed-out pins Connect the OCSM connector and make sure it seats correctly. Verify the concern is still present. Is the concern still present? Yes: INSTALL a new OCSM . Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-372796) . CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules.
V38 CHECK FOR CORRECT PSCM OPERATION Disconnect all the PSCM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the PSCM connectors and make sure they seat correctly. Verify the concern is still present. Is the concern still present? Yes: INSTALL a new steering gear. Refer to «POWER STEERING»(ref-372769) . CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules.
V39 CHECK FOR CORRECT IC OPERATION Disconnect the IC connector. Check for: corrosion damaged pins pushed-out pins Connect the IC connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes: INSTALL a new IC . Refer to «INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES»(ref-372777) . CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules.
V40 CHECK FOR CORRECT APIM OPERATION Disconnect the APIM connector. Check for: corrosion damaged pins pushed-out pins Connect the APIM connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes: INSTALL a new APIM . Refer to «INFORMATION AND ENTERTAINMENT SYSTEMS»(ref-372799) . CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules.

PINPOINT TEST W: INTERMITTENT NO MS-CAN COMMUNICATION, COMMUNICATION CAN BE INTERMITTENTLY ESTABLISHED

Note. Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.

Note. Various network DTCs set while disabling modules in this test procedure, which need to be cleared after the diagnostic procedure is completed.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 92

Scheme 92: PINPOINT TEST W: INTERMITTENT NO MS-CAN COMMUNICATION, COMMUNICATION CAN BE INTERMITTENTLY ESTABLISH

Scheme 93

Scheme 94

Scheme 95

W1 CHECK THE DLC PINS FOR DAMAGE Ignition OFF. Disconnect the scan tool cable from the Data Link Connector (DLC). Inspect DLC pins 3 and 11 for damage. Are DLC pins 3 and 11 OK? Yes: GO to W2 . No: REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
W2 CHECK THE MS-CAN TERMINATION RESISTANCE Disconnect: Negative Battery Cable. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance between 54 and 66 ohms? Yes: GO to W3 . No: GO to «PINPOINT TEST X»(ref-372772-S27033926312010093000000) .
W3 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: GO to W4 . No: GO to «PINPOINT TEST X»(ref-372772-S27033926312010093000000) .
W4 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE Connect: Negative Battery Cable. Ignition ON. Measure the voltage between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Is the voltage greater than 6 volts? Yes: REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool. No: GO to W5 .
W5 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE SJB DISABLED Disconnect: Smart Junction Box (SJB) Fuse 5 (10A). Enter the following diagnostic mode on the scan tool: Network Test. Repeat the network test. Do all other MS-CAN modules pass the network test? Yes: INSTALL the removed fuse. GO to «PINPOINT TEST R»(ref-372772-S20937711582010093000000) . No: INSTALL the removed fuse. GO to W6 .
W6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ACM DISABLED Disconnect: SJB Fuse 39 (20A). Enter the following diagnostic mode on the scan tool: Network Test. Repeat the network test. Do all other MS-CAN modules pass the network test? Yes: INSTALL the removed fuse. GO to «PINPOINT TEST K»(ref-372772-S35707693632010093000000) . No: INSTALL the removed fuse. If the vehicle is equipped with an audio DSP module, GO to W7 . If the vehicle is not equipped with an audio DSP module, GO to W8 .
W7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE AUDIO DSP MODULE DISABLED Disconnect: Battery Junction Box (BJB) Fuse 7 (30A). Enter the following diagnostic mode on the scan tool: Network Test. Repeat the network test. Do all other MS-CAN modules pass the network test? Yes: INSTALL the removed fuse. GO to «PINPOINT TEST L»(ref-372772-S17042893172010093000000) . No: INSTALL the removed fuse. GO to W8 .
W8 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM, FDIM, GPSM, LTM AND RETM DISABLED Disconnect: SJB Fuse 14 (10A). Enter the following diagnostic mode on the scan tool: Network Test. Repeat the network test. Do all other MS-CAN modules pass the network test? Yes: INSTALL the removed fuse. GO to W9 . No: INSTALL the removed fuse. GO to W10 .
W9 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM, FDIM, GPSM, LTM AND RETM DISCONNECTED Disconnect: APIM C3342 (If Equipped). Enter the following diagnostic mode on the scan tool: Network Test. If all other HS-CAN modules pass the network test, skip to end of test step. Otherwise, continue. Disconnect: FDIM C2123 (If Equipped). Enter the following diagnostic mode on the scan tool: Network Test. If all other HS-CAN modules pass the network test, skip to end of test step. Otherwise, continue. Disconnect: GPSM C2300 (If Equipped). Enter the following diagnostic mode on the scan tool: Network Test. If all other HS-CAN modules pass the network test, skip to end of test step. Otherwise, continue. Disconnect: LTM C4174a (If Equipped). Enter the following diagnostic mode on the scan tool: Network Test. Repeat the network test. If all other HS-CAN modules pass the network test, skip to end of test step. Otherwise, continue. Disconnect: RETM C2949b (If Equipped). Enter the following diagnostic mode on the scan tool: Network Test. Repeat the network test. Do all other HS-CAN modules pass the network test? Yes: CONNECT all modules. For APIM GO to «PINPOINT TEST T»(ref-372772-S14679216772010093000000) . For FDIM , GO to «PINPOINT TEST N»(ref-372772-S33635755512010093000000) . For GPSM , GO to «PINPOINT TEST S»(ref-372772-S35047595282010093000000) . For LTM , GO to «PINPOINT TEST Q»(ref-372772-S04522833352010093000000) . For RETM , GO to «PINPOINT TEST P»(ref-372772-S15627287232010093000000) . No: An intermittent fault is not present. GO to «PINPOINT TEST X»(ref-372772-S27033926312010093000000) .
W10 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE HVAC MODULE DISABLED Disconnect: SJB Fuse 15 (10A). Enter the following diagnostic mode on the scan tool: Network Test. Repeat the network test. Do all other MS-CAN modules pass the network test? Yes: INSTALL the removed fuse. GO to «PINPOINT TEST J»(ref-372772-S07454614212010093000000) . No: INSTALL the removed fuse. If the vehicle is equipped with a DSM , GO to W11 . If the vehicle is not equipped with a DSM , GO to W12 .
W11 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE DSM DISABLED Disconnect: BJB Fuse 32 (30A). Enter the following diagnostic mode on the scan tool: Network Test. Repeat the network test. Do all other MS-CAN modules pass the network test? Yes: INSTALL the removed fuse. GO to «PINPOINT TEST O»(ref-372772-S33389189562010093000000) . No: INSTALL the removed fuse. GO to W12 .
W12 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE FCIM DISABLED Disconnect: Front Controls Interface Module (FCIM) Fuse 16 (15A). Enter the following diagnostic mode on the scan tool: Network Test. Repeat the network test. Do all other MS-CAN modules pass the network test? Yes: INSTALL the removed fuse. GO to «PINPOINT TEST M»(ref-372772-S19763719072010093000000) . No: INSTALL the removed fuse. GO to W13 .
W13 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IC DISABLED Disconnect: SJB Fuses 26 (10A) and 29 (5A). Enter the following diagnostic mode on the scan tool: Network Test. Repeat the network test. Do all other MS-CAN modules pass the network test? Yes: INSTALL the removed fuses. GO to «PINPOINT TEST C»(ref-372772-S42705113432010093000000) . No: INSTALL the removed fuses. GO to «PINPOINT TEST X»(ref-372772-S27033926312010093000000) .

Pinpoint Test X: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

PINPOINT TEST X: NO MS-CAN COMMUNICATION, ALL MODULES ARE NOT RESPONDING

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 96

Scheme 96: PINPOINT TEST X: NO MS-CAN COMMUNICATION, ALL MODULES ARE NOT RESPONDING

Scheme 97

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Scheme 100

Scheme 101

Scheme 102

Scheme 103

Scheme 104

Scheme 105

Scheme 106

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Scheme 108

Scheme 109

Scheme 110

Scheme 111

Scheme 112

Scheme 113

Scheme 114

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Scheme 116

Scheme 117

Scheme 118

Scheme 119

Scheme 120

Scheme 121

Scheme 122

Scheme 123

Scheme 124

Scheme 125

X1 CHECK THE DLC PINS FOR DAMAGE Ignition OFF. Disconnect the scan tool cable from the Data Link Connector (DLC). Inspect DLC pins 3 and 11 for damage. Are DLC pins 3 and 11 OK? Yes: GO to X2 . No: REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
X2 CHECK THE MS-CAN TERMINATION RESISTANCE Disconnect: Negative Battery Cable. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance between 54 and 66 ohms? Yes: GO to X3 . No: GO to X5 .
X3 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: GO to X4 . No: GO to X25 .
X4 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE Connect: Negative Battery Cable. Ignition ON. Measure the voltage between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Is the voltage greater than 6 volts? Yes: REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The Controller Area Network (CAN) has tested within specifications. GO to «PINPOINT TEST W»(ref-372772-S12749162762010093000000) to diagnose the intermittent MS-CAN fault.
X5 CHECK THE MS-CAN TERMINATION RESISTOR Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance between 108 and 132 ohms? Yes: GO to X6 . No: GO to X9 .
X6 CHECK THE MS-CAN TERMINATION RESISTOR WITH THE SJB DISCONNECTED Disconnect: SJB C2280b. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance between 108 and 132 ohms? Yes: GO to X7 . No: GO to X8 .
X7 CHECK THE MS-CAN CIRCUITS BETWEEN THE SJB AND THE DLC FOR AN OPEN Measure the resistance between the SJB C2280b-37, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the SJB C2280b-38, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to X39 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
X8 CHECK THE MS-CAN CIRCUITS BETWEEN THE IC AND THE DLC FOR AN OPEN Disconnect: IC C220. Measure the resistance between the IC C220-12, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the IC C220-13, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? Yes: CONNECT the negative battery cable. GO to X47 . No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
X9 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? Yes: GO to X11 . No: GO to X10 .
X10 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR AN OPEN Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance greater than 10,000 ohms? Yes: The CAN has tested within specifications. CONNECT the negative battery cable. VERIFY the scan tool operation on a substitute vehicle. CLEAR the DTCs. REPEAT the network test on the suspect vehicle. No: A capacitor internal to a module may still be draining, causing irregular resistance readings. WAIT 5 minutes. REPEAT the pinpoint test.
X11 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE SJB DISCONNECTED Disconnect: SJB C2280b. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? Yes: If the vehicle is equipped with a Global Positioning System Module (GPSM), GO to X12 . If the vehicle is not equipped with a GPSM , GO to X13 . No: CONNECT the negative battery cable. GO to X39 .
X12 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE GPSM DISCONNECTED Disconnect: GPSM C2300. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? Yes: GO to X13 . No: CONNECT the negative battery cable. GO to X40 .
X13 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE ACM DISCONNECTED Disconnect: ACM C240c. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? Yes: If the vehicle is equipped with an audio DSP module, GO to X14 . If the vehicle is not equipped with an audio DSP module, GO to X15 . No: CONNECT the negative battery cable. GO to X41 .
X14 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE AUDIO DSP MODULE DISCONNECTED Disconnect: Audio DSP Module C4208a. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? Yes: GO to X15 . No: CONNECT the negative battery cable. GO to X42 .
X15 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE FCIM DISCONNECTED Disconnect: FCIM C2402. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? Yes: If the vehicle is equipped with a Front Display Interface Module (FDIM), GO to X16 . If the vehicle is not equipped with an FDIM, GO to X17. No: CONNECT the negative battery cable. GO to X43 .
X16 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE FDIM DISCONNECTED Disconnect: FDIM C2123. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? Yes: GO to X17 . No: CONNECT the negative battery cable. GO to X44 .
X17 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE HVAC MODULE DISCONNECTED Disconnect: HVAC Module C228a. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? Yes: If the vehicle is equipped with an RETM , GO to X18 . If the vehicle is not equipped with an RETM, GO to X19. No: CONNECT the negative battery cable. GO to X45 .
X18 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE RETM DISCONNECTED Disconnect: RETM C2949b. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? Yes: GO to X19 . No: CONNECT the negative battery cable. GO to X46 .
X19 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE IC DISCONNECTED Disconnect: IC C220. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? Yes: If the vehicle is equipped with an LTM , GO to X20 . If the vehicle is not equipped with an LTM , GO to X21 . No: CONNECT the negative battery cable. GO to X47 .
X20 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE LTM DISCONNECTED Disconnect: LTM C4174a. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? Yes: GO to X21 . No: CONNECT the negative battery cable. GO to X48 .
X21 VERIFY VEHICLE EQUIPMENT - DSM Verify whether the vehicle is equipped with a DSM . Is the vehicle equipped with a DSM? Yes: GO to X22 . No: GO to X23 .
X22 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE DSM DISCONNECTED Disconnect: DSM C341d. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? Yes: GO to X23 . No: CONNECT the negative battery cable. GO to X49 .
X23 VERIFY VEHICLE EQUIPMENT - APIM Verify whether the vehicle is equipped with an APIM . Is the vehicle equipped with an APIM? Yes: GO to X24 . No: REPAIR the circuit. CONNECT all modules. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
X24 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE APIM DISCONNECTED Disconnect: APIM C3342. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? Yes: REPAIR the circuit. CONNECT all modules. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool. No: CONNECT the negative battery cable. GO to X50 .
X25 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE SJB DISCONNECTED Disconnect: SJB C2280b. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: CONNECT the negative battery cable. GO to X39 . No: If the vehicle is equipped with a Global Positioning System Module (GPSM), GO to X26 . If the vehicle is not equipped with a GPSM, GO to X27.
X26 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE GPSM DISCONNECTED Disconnect: GPSM C2300. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: CONNECT the negative battery cable. GO to X40 . No: GO to X27 .
X27 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE ACM DISCONNECTED Disconnect: ACM C240c. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: CONNECT the negative battery cable. GO to X41 . No: If the vehicle is equipped with an audio DSP module, GO to X28 . If the vehicle is not equipped with an audio DSP module, GO to X29 .
X28 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE AUDIO DSP MODULE DISCONNECTED Disconnect: Audio DSP Module C4208a. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: CONNECT the negative battery cable. GO to X42 . No: GO to X29 .
X29 CHECK THE MS-CAN (+) AND MS-CAN(-) CIRCUITS FOR A SHORT TO GROUND WITH THE FCIM DISCONNECTED Disconnect: FCIM C2402. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: CONNECT the negative battery cable. GO to X43 . No: If the vehicle is equipped with an FDIM , GO to X30 . If the vehicle is not equipped with an FDIM, GO to X31.
X30 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE FDIM DISCONNECTED Disconnect: FDIM C2123. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: CONNECT the negative battery cable. GO to X44 . No: GO to X31 .
X31 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE HVAC MODULE DISCONNECTED Disconnect: HVAC Module C228a. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: CONNECT the negative battery cable. GO to X45 . No: If the vehicle is equipped with an RETM , GO to X32 . If the vehicle is not equipped with an RETM, GO to X33.
X32 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE RETM DISCONNECTED Disconnect: RETM C2949b. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: CONNECT the negative battery cable. GO to X46 . No: GO to X33 .
X33 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE IC DISCONNECTED Disconnect: IC C220. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: CONNECT the negative battery cable. GO to X47 . No: If the vehicle is equipped with an LTM , GO to X34 . If the vehicle is not equipped with an LTM, GO to X35.
X34 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE LTM DISCONNECTED Disconnect: LTM C4174a. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: CONNECT the negative battery cable. GO to X48 . No: GO to X35 .
X35 VERIFY VEHICLE EQUIPMENT - DSM Verify whether the vehicle is equipped with a DSM . Is the vehicle equipped with a DSM? Yes: GO to X36 . No: GO to X37 .
X36 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE DSM DISCONNECTED Disconnect: DSM C341d. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: CONNECT the negative battery cable. GO to X49 . No: GO to X37 .
X37 VERIFY VEHICLE EQUIPMENT - APIM Verify whether the vehicle is equipped with an APIM . Is the vehicle equipped with an APIM? Yes: GO to X38 . No: REPAIR the circuit. CONNECT all modules. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
X38 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE APIM DISCONNECTED Disconnect: APIM C3342. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? Yes: CONNECT the negative battery cable. GO to X50 . No: REPAIR the circuit. CONNECT all modules. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
X39 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion damaged pins pushed-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-372773) . CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
X40 CHECK FOR CORRECT GPSM OPERATION Disconnect the GPSM connector. Check for: corrosion damaged pins pushed-out pins Connect the GPSM connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes: INSTALL a new GPSM . Refer to «INFORMATION AND ENTERTAINMENT SYSTEMS»(ref-372799) . CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules.
X41 CHECK FOR CORRECT ACM OPERATION Disconnect all the ACM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the ACM 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 ACM . Refer to «INFORMATION AND ENTERTAINMENT SYSTEMS»(ref-372799) . CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules.
X42 CHECK FOR CORRECT AUDIO DSP MODULE OPERATION Disconnect all the audio DSP module connectors. Check for: corrosion damaged pins pushed-out pins Connect all the audio DSP 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 audio DSP module. Refer to «INFORMATION AND ENTERTAINMENT SYSTEMS»(ref-372799) . CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules.
X43 CHECK FOR CORRECT FCIM OPERATION Disconnect the FCIM connector. Check for: corrosion damaged pins pushed-out pins Connect the FCIM connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes: INSTALL a new FCIM . Refer to «INFORMATION AND ENTERTAINMENT SYSTEMS»(ref-372799) . CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules.
X44 CHECK FOR CORRECT FDIM OPERATION Disconnect the FDIM connector. Check for: corrosion damaged pins pushed-out pins Connect the FDIM connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes: INSTALL a new FDIM . Refer to «INFORMATION AND ENTERTAINMENT SYSTEMS»(ref-372799) . CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules.
X45 CHECK FOR CORRECT HVAC MODULE OPERATION Disconnect all the HVAC module connectors. Check for: corrosion damaged pins pushed-out pins Connect all the HVAC 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 HVAC module. Refer to «CLIMATE CONTROL»(ref-372816) . CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules.
X46 CHECK FOR CORRECT RETM OPERATION Disconnect the RETM connector. Check for: corrosion damaged pins pushed-out pins Connect the RETM connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes: INSTALL a new RETM . Refer to «INFORMATION AND ENTERTAINMENT SYSTEMS»(ref-372799) . CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules.
X47 CHECK FOR CORRECT IC OPERATION Disconnect the IC connector. Check for: corrosion damaged pins pushed-out pins Connect the IC connector and make it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes: INSTALL a new IC . Refer to «INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES»(ref-372777) . CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules.
X48 CHECK FOR CORRECT LTM OPERATION Disconnect all the LTM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the LTM 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 LTM . Refer to «BODY CLOSURES»(ref-372826) . CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules.
X49 CHECK FOR CORRECT DSM OPERATION Disconnect all the DSM connectors. Check for: corrosion damaged pins pushed-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-372773) . CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules.
X50 CHECK FOR CORRECT APIM OPERATION Disconnect the APIM connector. Check for: corrosion damaged pins pushed-out pins Connect the APIM connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes: INSTALL a new APIM . Refer to «INFORMATION AND ENTERTAINMENT SYSTEMS»(ref-372799) . CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules.

Pinpoint Test Y: No Power To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

Note. Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.

Note. Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

Scheme 126

Scheme 126: PINPOINT TEST Y: NO POWER TO THE SCAN TOOL

Scheme 127

Scheme 128

Y1 CHECK THE DLC PINS FOR DAMAGE Disconnect the scan tool cable from the DLC . Inspect DLC pins 4, 5 and 16 for damage. Are DLC pins 4, 5 and 16 OK? Yes: GO to Y2 . No: REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
Y2 CHECK THE DLC VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Measure the voltage between the DLC C251-16, circuit SBP20 (GN/RD), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to Y3 . No: VERIFY the Smart Junction Box (SJB) fuse 20 (15A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. REPEAT the network test with the scan tool.
Y3 CHECK THE DLC GROUND CIRCUITS FOR AN OPEN Disconnect: Negative Battery Cable. Measure the resistance between the DLC C251-4, circuit GD114 (BK/BU), harness side and ground; and between the DLC C251-5, circuit GD114 (BK/BU), harness side and ground. Are the resistances less than 5 ohms? Yes: REPAIR the scan tool. CONNECT the negative battery cable. REPEAT the network test with the scan tool. No: REPAIR the circuit in question. CONNECT the negative battery cable. REPEAT the network test with the scan tool.

Module Communications Network: Diagnosis Ford Flex I

Inspection and Verification

DTC Charts

Communication Network DTC Chart

Symptom Chart

Pinpoint Test A: The PCM Does Not Respond To The Scan Tool

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Pinpoint Test B: The ABS Module Does Not Respond To The Scan Tool

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Pinpoint Test C: The Instrument Cluster (IC) Does Not Respond To The Scan Tool

PINPOINT TEST C: THE IC DOES NOT RESPOND TO THE SCAN TOOL

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Pinpoint Test D: The Restraints Control Module (RCM) Does Not Respond To The Scan Tool

PINPOINT TEST D: THE RCM DOES NOT RESPOND TO THE SCAN TOOL

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Pinpoint Test E: The Occupant Classification System Module (OCSM) Does Not Respond To The Scan Tool

PINPOINT TEST E: THE OCSM DOES NOT RESPOND TO THE SCAN TOOL

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Pinpoint Test F: The 4X4 Control Module Does Not Respond To The Scan Tool

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Pinpoint Test G: The Power Steering Control Module (PSCM) Does Not Respond To The Scan Tool

PINPOINT TEST G: THE PSCM DOES NOT RESPOND TO THE SCAN TOOL

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Pinpoint Test H: The Steering Angle Sensor Module (SASM) Does Not Respond To The Scan Tool

PINPOINT TEST H: THE SASM DOES NOT RESPOND TO THE SCAN TOOL

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Pinpoint Test I: The Parking Aid Module (PAM) Does Not Respond To The Scan Tool

PINPOINT TEST I: THE PAM DOES NOT RESPOND TO THE SCAN TOOL

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Pinpoint Test J: The HVAC Module Does Not Respond To The Scan Tool

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Pinpoint Test K: The Audio Control Module (ACM) Does Not Respond To The Scan Tool

PINPOINT TEST K: THE ACM DOES NOT RESPOND TO THE SCAN TOOL

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Pinpoint Test L: The Audio Digital Signal Processing (DSP) Module Does Not Respond To The Scan Tool

PINPOINT TEST L: THE AUDIO DSP MODULE DOES NOT RESPOND TO THE SCAN TOOL

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Pinpoint Test M: The Front Controls Interface Module (FCIM) Does Not Respond To The Scan Tool

PINPOINT TEST M: THE FCIM DOES NOT RESPOND TO THE SCAN TOOL

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