Headlamp Control Module B (HCMB)

WARNING: This page is about a different car, the 2011 Jaguar XKR, 2011 Jaguar XK, 2010 Jaguar XKR, and 2010 Jaguar XK. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Diagnosis by substitution from a donor vehicle is NOT acceptable. Substitution of control modules does not guarantee confirmation of a fault and may also cause additional faults in the vehicle being checked and/or the donor vehicle.

CAUTION: When probing connectors to take measurements in the course of the pinpoint tests, use the adaptor kit, part number 3548-1358-00.

NOTE: If the control module or a component is suspect and the vehicle remains under manufacturer warranty, refer to the Warranty Policy and Procedures manual (section B1.2), or determine if any prior approval programme is in operation, prior to the installation of a new module/component.

NOTE: Generic scan tools may not read the codes listed, or may read only 5-digit codes. Match the 5 digits from the scan tool to the first 5 digits of the 7-digit code listed to identify the fault (the last 2 digits give extra information read by the manufacturer approved diagnostic system).

NOTE: When performing voltage or resistance tests, always use a digital multimeter (DMM) accurate to three decimal places, and with an up-to-date calibration certificate. When testing resistance, always take the resistance of the DMM leads into account.

NOTE: Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

NOTE: If DTCs are recorded and, after performing the pinpoint tests a fault is not present, an intermittent concern may be the cause. Always check for loose connections and corroded terminals.

NOTE: Where an 'on demand self-test' is referred to, this can be accessed via the 'DTC Monitor' tab on the manufacturers approved diagnostic system.

The table below lists all Diagnostic Trouble Codes (DTCs) that could be logged in the Headlamp Control Module B, for additional Diagnosis and Testing information. For additional information, refer to: HEADLAMPS .

DTC	Description	Possible Causes	Action
B1286-16	Interior Mirror - Circuit voltage below threshold	Mirror circuit voltage below threshold The electrochromic function does not work The electrochromic function does not work	This DTC is for information only. Clear the DTC and retest. If the problem persists, renew the mirror module. Refer to the warranty policy and procedures manual if a module is suspect
B1286-17	Interior Mirror - Circuit voltage above threshold	Mirror circuit voltage above threshold The electrochromic function does not work	This DTC is for information only. Clear the DTC and retest. If the problem persists, renew the mirror module. Refer to the warranty policy and procedures manual if a module is suspect
B1286-44	Interior Mirror - Data memory failure	Mirror control module data memory failure (the electrochromic function does not work)	Renew the interior mirror module. Refer to the warranty policy and procedures manual if a module is suspect
B1286-47	Interior Mirror - Watchdog/safety micro controller failure	Control module watchdog/safety Micro controller failure The electrochromic function does not work	This DTC is for information only. Clear the DTC and retest. If the problem persists, renew the mirror module. Refer to the warranty policy and procedures manual if a module is suspect
B1286-49	Interior Mirror - Internal electronic failure	Mirror internal failures (Active Light Sensor) The electrochromic function does not work	Renew the interior mirror module. Refer to the warranty policy and procedures manual if a module is suspect
B1286-60	Interior Mirror	Operation Temperature below limit (the electrochromic function does not work)	Allow the vehicle interior temperature to increase, clear the DTC and retest. Consider the environmental conditions before condemning the module
B1286-78	Interior Mirror - Alignment or adjustment incorrect	DTC for information only and is logged whenever the increased sensitivity mode has been activated to provide a log of the number of times the feature has been used (increased sensitivity mode is cancelled when the ignition is cycled)	Ignore/clear this DTC
B1286-96	Interior Mirror - Component internal failure	Mirror internal failures	Renew the interior mirror module. Refer to the warranty policy and procedures manual if a module is suspect
B1286-97	Interior Mirror - Component or system operation obstructed or blocked	Mirror internal camera component or system operation obstructed or blocked	Remove obstructions from the mirror camera (remove stickers etc., clean windscreen inside and out). Clear the DTC and retest for normal operation
B1286-98	Interior Mirror - Component or system over temperature	Component or system over temperature	Consider the environmental conditions before condemning the module. Allow the component/system to cool, clear the DTC and retest for normal operation
B12AC-11	Electrochromic Door Mirror - Circuit short to ground	Electrochromic door mirror output circuit short to ground	Refer to the electrical circuit diagrams and check the mirror circuit. Repair as necessary
B12AC-12	Electrochromic Door Mirror -Circuit short to battery	Electrochromic door mirror output circuit short to power	Refer to the electrical circuit diagrams and check the mirror circuit. Repair as necessary
B12EB-78	Camera Horizontal Alignment - Alignment or adjustment incorrect	Mirror internal camera alignment or adjustment incorrect Mirror module fault Windscreen alignment incorrect	Check the mirror for security and correct positioning. Clear the DTC and retest for normal operation. If the problem persists, renew the mirror module. Refer to the warranty policy and procedures manual if a module is suspect
B12EC-78	Camera Vertical Alignment - Alignment or adjustment incorrect	Mirror internal camera alignment or adjustment incorrect Mirror module fault Windscreen alignment incorrect	Check the mirror for security and correct positioning. Clear the DTC and retest for normal operation. If the problem persists, renew the mirror module. Refer to the warranty policy and procedures manual if a module is suspect
B134A-78	Target Aim Verification - Camera Horizontal Alignment - Alignment or adjustment incorrect	Mirror internal camera alignment or adjustment incorrect Mirror module fault Windscreen alignment incorrect	DTC for information only. Clear/ignore DTC
B134B-78	Target Aim Vertical - Camera Horizontal Alignment - Alignment or adjustment incorrect	Mirror internal camera alignment or adjustment incorrect Mirror module fault Windscreen alignment incorrect	DTC for information only. Clear/ignore DTC
U0010-88	Medium Speed CAN Communication Bus - Bus off	Bus off	Refer to the electrical circuit diagrams and check the power and ground connections to the module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Refer to the electrical circuit diagrams and check the CAN network
U0140-00	Lost Communication With Body Control Module - No sub type information	No sub type information	Refer to the electrical circuit diagrams and check the power and ground connections to the module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Refer to the electrical circuit diagrams and check the CAN network between the Central Junction Box and Rain/Light Sensor
U0300-00	Internal Control Module Software Incompatibility - No sub type information	No sub type information	Using the manufacturer approved diagnostic system, ensure that the module contains the latest software version and is correctly configured, update if necessary. Clear the DTC and retest
U201A-57	Control Module Main Calibration Data - Invalid/incomplete software component	Invalid/incomplete software component Main calibration is invalid to car configuration file or not complete stored to the mirror	Using the manufacturers approved diagnostic system, check the configuration of the car configuration file and software version of the module is correct
U2100-00	Initial Configuration Not Complete - No sub type information	No sub type information	Wait 30 seconds, clear DTC and retest
U2101-00	Control Module Configuration Incompatible - No sub type information	No sub type information	Using the manufacturers approved diagnostic system, check the configuration of the car configuration file