Pinpoint Test R: No Power To The Scan Tool

Communications Network

Pinpoint Test R: No Power To The Scan Tool

Refer to Wiring Diagram Set 14, Module Communications Network for schematic and connector information Electrical Diagrams.

Normal Operation

The scan tool is connected to the Data Link Connector (DLC) to communicate with the High Speed Controller Area Network (HS-CAN), the Medium Speed Controller Area Network (MS-CAN) and the Infotainment Controller Area Network (I-CAN).

A loss of ground or poor ground at the DLC (Data Link Connector) may result in HS-CAN (High Speed Controller Area Network), MS-CAN (Medium Speed Controller Area Network) or I-CAN (Infotainment Controller Area Network) faults while the scan tool is connected.

This pinpoint test is intended to diagnose the following:

- Fuse

- Wiring, terminals or connectors

- Scan tool

- DLC (Data Link Connector)

PINPOINT TEST R : NO POWER TO THE SCAN TOOL

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

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings.

R1 CHECK THE DLC (Data Link Connector) PINS FOR DAMAGE

- Ignition OFF.

- Disconnect the scan tool cable from the DLC (Data Link Connector).

- Inspect DLC (Data Link Connector) pins 4, 5 and 16 for damage.





Are DLC (Data Link Connector) pins 4, 5 and 16 OK?

Yes
GO to R2.

No
REPAIR the DLC (Data Link Connector) as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.

R2 CHECK THE DLC (Data Link Connector) VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

- Measure the voltage between the DLC (Data Link Connector) C251-16, circuit SBP05 (GY/RD), harness side and ground.





Is the voltage greater than 10 volts?

Yes
GO to R3.

No
VERIFY the Central Junction Box (CJB) fuse 5 (15A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short Electrical Diagrams. REPEAT the network test with the scan tool.

R3 CHECK THE DLC (Data Link Connector) GROUND CIRCUITS FOR AN OPEN

- Disconnect: Negative Battery Cable.

- Measure the resistance between the DLC (Data Link Connector) C251-4, circuit GD115 (BK/GY), harness side and ground; and between the DLC (Data Link Connector) C251-5, circuit GD115 (BK/GY), 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. REPEAT the network test with the scan tool.