How to Troubleshoot the Body Electrical

Tips and Precautions

Special Tools Required

Back Probe Adapter, 17 mm 07TAZ-001020A

Before Troubleshooting

1.	Check applicable fuses in the appropriate fuse/relay box.

Check the 12 volt battery for damage, state of charge, and clean and tight connections.

	Do not quick-charge a 12 volt battery unless the 12 volt battery ground cable has been disconnected; otherwise you will damage the alternator diodes.
	Do not attempt to crank the engine with the 12 volt battery ground cable loosely connected, or you will severely damage the wiring.

Handling Connectors

	Make sure the connectors are clean and have no loose wire terminals.
	Make sure multiple cavity connectors are packed with dielectric grease (except waterproof connectors).
	All connectors have push-down release type locks (A).

	Some connectors have a clip on their side used to attach them to a mount bracket on the body or on another component. This clip has a pull type lock.
	Some mounted connectors cannot be disconnected unless you first release the lock and remove the connector from its mount bracket (A).

	Never try to disconnect connectors by pulling on their wires; pull on the connector halves instead.
	Always reinstall plastic covers.

Before connecting connectors, make sure the terminals are in place and not bent (A).

Check for loose retainers (A) and rubber seals (B).

The backs of some connectors are packed with dielectric grease. Add grease if necessary. If the grease is contaminated, replace it.

	Insert the connector all the way and make sure it is securely locked.
	Position wires so that the open end of the cover faces down.

Handling Wires and Harnesses

	Secure wires and wire harnesses to the frame with their respective wire ties at the designated locations.
	Remove clips carefully; do not damage their locks (A).

	After installing harness clips, make sure the harness does not interfere with any moving parts.
	Keep wire harnesses away from exhaust components and other hot parts, from sharp edges of brackets and holes, and from exposed screws and bolts.
	Seat grommets in their grooves properly (A). Do not leave grommets distorted (B).

Testing and Repairs

	Do not use wires or harnesses with broken insulation. Replace them or repair them by wrapping the break with electrical tape or shrink tubing.
	Never attempt to modify, splice, or repair SRS wiring. If there is an open or damage to the SRS wiring or terminals, replace the harness.
	After installing parts, make sure that no wires are pinched under them.
	When using electrical test equipment, follow the manufacturer's instructions and those described in this manual.
	If possible, insert the probe of the tester from the wire side (except waterproof connectors).

Use back probe adapter, 17mm 07TAZ-001020A.

Refer to the instructions in the Honda Terminal Kit for identification and replacement of connector terminals.

Five-Step Troubleshooting

1.	Verify The Complaint: Turn on all the components in the problem circuit to verify the customer complaint. Note the symptoms. Do not begin disassembly or testing until you have narrowed down the problem area.

Analyze The Schematic:

Look up the schematic for the problem circuit. Determine how the circuit is supposed to work by tracing the current paths from the power feed through the circuit components to ground. If several circuits fail at the same time, the fuse or a ground is a likely cause.

Based on the symptoms and your understanding of the circuit operation, identify one or more possible causes of the problem.

3.	Isolate The Problem By Testing The Circuit: Make circuit tests to check the diagnosis you made in step 2. Keep in mind that a logical, simple procedure is the key to efficient troubleshooting. Test for the most likely cause of failure first. Try to make tests at points that are easily accessible.

4.	Fix The Problem: Once the specific problem is identified, make the repair. Be sure to use proper tools and safe procedures.

5.	Make Sure The Circuit Works: Turn on all components in the repaired circuit in all modes to make sure you've fixed the entire problem. If the problem was a blown fuse, be sure to test all of the circuits on the fuse. Make sure no new problems turn up and the original problem does not recur.

Wire Color Codes

The following abbreviations are used to identify wire colors in the circuit schematics:

WHT..............................................................................	White
YEL...............................................................................	Yellow
BLK...............................................................................	Black
BLU...............................................................................	Blue
GRN..............................................................................	Green
RED..............................................................................	Red
ORN..............................................................................	Orange
PNK..............................................................................	Pink
BRN..............................................................................	Brown
GRY..............................................................................	Gray
PUR..............................................................................	Purple
TAN...............................................................................	Tan
LT BLU.........................................................................	Light Blue
LT GRN........................................................................	Light Green
LT PUR........................................................................	Light Purple

The wire insulation has one color or one color with another color stripe. The second color is the stripe.

Troubleshoot the B-CAN Circuit Related Problems

Check the PCM for DTCs and troubleshoot PCM or F-CAN loss of communication errors first.

How to Check for DTCs with the HDS (preferred method)

The HDS can check F-CAN and B-CAN communication status, read and clear DTCs, display data list, and perform function tests.

Check for DTCs

1.	Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.

2.	Turn the vehicle to the ON mode.

3.	Make sure the HDS communicates with the vehicle. NOTE: If the HDS does not communicate with the vehicle, troubleshoot the DLC circuit.

4.	Select BODY ELECTRICAL, then select the desired MODE MENU, and check for DTCs. If the DTCs do not pertain to the select menu, select the ALL DTC Check icon to view all Body Electrical DTCs. NOTE: For specific operations, refer to the HDS user's manual.

5.	If any DTCs are indicated, go to the indicated DTCs troubleshooting. NOTE: If DTC U1280 is stored, troubleshoot DTC U1280 first.

How to Clear DTCs with the HDS

1.	Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.

2.	Turn the vehicle to the ON mode.

3.	Clear the DTCs with the HDS.

4.	Turn the vehicle to the OFF (LOCK) mode, and disconnect the HDS from the DLC.

B-CAN Circuit Troubleshooting Information

1.	Connect the HDS to the data link connector (DLC).

2.	From the BODY ELECTRICAL SYSTEM SELECT menu, select B-CAN CONTROL UNITS INFORMATION, and then select CHECK CONNECTED CONTROL UNITS.

Check that the electronic control units (ECU) are communicating with the HDS.

NOTE:

	If an ECU is communicating with the HDS, "DETECT" will be displayed.
	If an ECU is not communicating, or the vehicle is not equipped with that ECU, "NOT AVAILABLE" will be displayed.

If a control unit is not communicating, confirm which ECUs are communicating, then refer to the B-CAN Communication Line from the Electrical Wiring Diagrams to find the malfunction point.

For example, when unit "K" is communicating, but units "G", "M", and "N" are not communicating, that will direct you to the malfunction point (A).

Loss of Communication DTC Cross-Reference Chart

When an ECU on the CAN circuit is unable to communicate with other ECUs on the CAN circuit, the other control units will set loss of communication DTCs. Use this chart to find the ECU that is not communicating with the other ECUs on the CAN circuit.

1.	Find the Transmitting Control Unit that is in the same row as all of the loss of communication DTCs that you retrieved.

2.	Do the input test for the transmitting control unit.

BUS OFF and Internal Error Codes

DTC Type

Related Unit

Body Control Module

Gauge Control Module

Climate Control Unit

Front Seat Heater Control Unit

Power Window Master Switch

Keyless Access Control Unit

Power Control Unit

Backup Control Unit

Automatic Lighting/
Rain Sensor

Automatic Lighting Control Unit-Sensor

Immobilizer-Keyless Control Unit

Parking and
Back-Up Sensor Control Unit

Wireless Charger

BUS OFF

U1280

ECU (EEPROM) Error

B1002

B1602

B2352

B2602

Loss of Communication

Transmitting Control Unit

Receiving Unit/Loss of Communication DTC

Body Control Module

Gauge Control Module

Climate Control Unit

Front Seat Heater Control Unit

Power Window Master Switch

Keyless Access Control Unit

Power Control Unit

Backup Control Unit

Automatic Lighting/
Rain Sensor

Automatic Lighting Control Unit-Sensor

Immobilizer-Keyless Control Unit

Parking and
Back-Up Sensor Control Unit

Wireless Charger

Body Control Module

U1281

Gauge Control Module

U128D

U0155

U128D

Climate Control Unit

U1064

U1299

Front Seat Heater Control Unit

U1290

PCM

U0100

Multipurpose Camera Unit

U129C

TCM

U0101

VSA
Modulator-Control Unit

U0122
U0128

U0122

Keyless Access Control Unit

U0127

U1286

EPS Control Unit

U0131

SRS Unit

U0151

Audio-Navigation Unit

U128E

Parking and Back-Up Sensor Control Unit

U1288

Adaptive Damper Control Unit

U0132

TX: Transmitting units do not set loss of communication DTCs.