P1638

A : P1638: CAN NETWORK MALFUNCTION, INSTRUMENT CLUSTER (IC)

G354462t27 : CHECK THE IC FOR DAMAGE
1. Inspect the IC for damage.

- Does the IC indicate any signs of damage?

-> Yes
INSTALL a new instrument cluster. CLEAR the DTC, test the system for normal operation.

-> No

G354462t28 : CHECK CAN + FOR SHORT CIRCUIT TO GROUND
1. Turn the ignition switch to the OFF position.
2. Measure the resistance between the diagnostic connector, pin 06 (Y) and GROUND.

- Is the resistance less than 10,000 ohms?

-> Yes
REPAIR the short circuit. CLEAR the DTC, test the system for normal operation.

-> No

G354462t29 : CHECK CAN + FOR SHORT CIRCUIT TO BATTERY
1. Measure the resistance between the diagnostic connector, pin 06 (Y) and pin 16 (OY).

- Is the resistance less than 10,000 ohms?

-> Yes
REPAIR the short circuit. CLEAR the DTC, test the system for normal operation.

-> No

G354462t30 : CHECK CAN - FOR SHORT CIRCUIT TO GROUND
1. Measure the resistance between the diagnostic connector, pin 14 (G) and GROUND.

- Is the resistance less than 10,000 ohms?

-> Yes
REPAIR the short circuit. CLEAR the DTC, test the system for normal operation.

-> No

G354462t31 : CHECK CAN - FOR SHORT CIRCUIT TO BATTERY
1. Measure the resistance between the diagnostic connector, pins 14 (G) and 16 (OY).

- Is the resistance less than 10,000 ohms?

-> Yes
REPAIR the short circuit. CLEAR the DTC, test the system for normal operation.

-> No

G354462t32 : CHECK FOR SHORT CIRCUIT BETWEEN CAN + AND CAN -
1. Disconnect the battery negative terminal.
2. Measure the resistance between the diagnostic connector, pins 06 (Y) and 14 (G).

- Is the resistance less than 10,000 ohms?

-> Yes
REPAIR the short circuit. CLEAR the DTC, test the system for normal operation.

-> No

G354462t33 : CHECK FOR OPEN CIRCUIT ON CAN + BETWEEN THE DIAGNOSTIC CONNECTOR AND THE IC
1. Disconnect the IC connector, IP10.
2. Measure the resistance between the diagnostic connector, pin 06 (Y) and IP10, pin 17 (Y).

- Is the resistance greater than 5 ohms?

-> Yes
REPAIR the high resistance circuit. CLEAR the DTC, test the system for normal operation.

-> No

G354462t34 : CHECK FOR OPEN CIRCUIT ON CAN - BETWEEN THE DIAGNOSTIC CONNECTOR AND THE IC
1. Measure the resistance between the diagnostic connector, pin 14 (G) and IP10, pin 18 (G).

- Is the resistance greater than 5 ohms?

-> Yes
REPAIR the high resistance circuit. CLEAR the DTC, test the system for normal operation.

-> No

G354462t35 : CHECK FOR CORRECT BUS TERMINATION
1. Reconnect the IC connector, IP10.
2. Measure the resistance between the diagnostic connector, pins 06 (Y) and 14 (G).

- Is the resistance between 50 and 70 ohms?

-> Yes
INSTALL a new instrument cluster. CLEAR the DTC, test the system for normal operation.

-> No

G354462t36 : CHECK CONTINUITY OF THE CAN + CIRCUIT BETWEEN THE ECM AND THE IC
1. To test:

- Is the resistance greater than 5 ohms?

-> Yes
REPAIR the high resistance circuit. CLEAR the DTC, test the system for normal operation.

-> No

G354462t37 : CHECK CONTINUITY OF THE CAN - CIRCUIT BETWEEN THE ECM AND THE IC
1. Measure the resistance between:

- Is the resistance greater than 5 ohms?

-> Yes
REPAIR the high resistance circuit. CLEAR the DTC, test the system for normal operation.

-> No

G354462t38 : CHECK FOR LOSS OF TERMINATION WITHIN THE ECM
1. Measure the resistance between:

- Is the resistance between 110 and 140 ohms?

-> Yes

-> No
Please check part is not on any form of prior authorization before replacement.

G354462t39 : CHECK FOR LOSS OF TERMINATION WITHIN THE IC
1. Measure the resistance between pins 17 and 18 of the IC.

- Is the resistance between 110 and 140 ohms?

-> Yes
Possible intermittent fault. Recheck DTCs.

-> No
INSTALL a new instrument cluster. CLEAR the DTC, test the system for normal operation.